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tmp/sympl-config/chats/session-2026-02-01T19-20-6552e001.json
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tmp/sympl-config/chats/session-2026-02-01T19-20-6552e001.json
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{
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"sessionId": "6552e001-f656-4b42-84e5-fc6b356936e2",
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"projectHash": "339afc76af47b371967d297054abd01cf428d7a3e1dfe3a0d2324c45dae7dc42",
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"startTime": "2026-02-01T19:22:01.415Z",
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"lastUpdated": "2026-02-05T17:50:58.305Z",
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"messages": [
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{
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"id": "2c61d5f7-281d-480a-80bd-ce1f56f3fdd0",
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"timestamp": "2026-02-01T19:22:01.415Z",
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"type": "user",
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"content": "write a blog post in markdown about how we are testing the filter. use anonymiused code if you have to. mention that i run sympl on a mythiuc beasts VM and link them."
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},
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{
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"id": "1c727e24-1643-47b2-901a-dd01bc266a31",
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"timestamp": "2026-02-01T19:23:52.672Z",
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"type": "info",
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"content": "Switched to fallback model gemini-3-flash-preview"
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},
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{
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"id": "b5f2a758-b8ed-4ae0-a55b-06ab7ae1ad28",
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"timestamp": "2026-02-01T19:23:57.735Z",
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"type": "gemini",
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"content": "",
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"toolCalls": [
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{
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"id": "read_file-1769973837106-d7e88d00edd0b8",
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"name": "read_file",
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"args": {
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"file_path": "GEMINI.md"
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},
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"result": [
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{
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"functionResponse": {
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"id": "read_file-1769973837106-d7e88d00edd0b8",
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"name": "read_file",
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"response": {
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"output": "# Sympl Configuration & Exim Filter Project\n\nThis repository manages configuration files for Sympl hosting, with a primary focus on Exim mail filter rules (`randomness.org.uk/mailboxes/bob/forward`).\n\n## Development Workflow\n\n### Testing\n**Crucial:** All changes to filter files must be verified using the Docker-based testing infrastructure.\n\n1. **Entry Point:** Use `.tests/run-tests.sh -v` to build the Docker image and run all tests in verbose mode.\n * **Note:** By default, tests run in quiet mode (only showing failures and summary). **Always use `-v`** during development to verify specific test execution.\n * This script executes `run-internal-tests.sh` inside the container, which **automatically discovers and runs all `test-*.sh` files** in the `.tests/` directory.\n2. **Manual Testing:**\n * `.tests/manual-test-address.sh`: Test a specific email address against the filter.\n * Usage: `.tests/manual-test-address.sh <from_address> [to_address] [subject]`\n3. **Adding Tests:**\n * Create a new script named `test-<name>.sh` in the `.tests/` directory.\n * Use the `run_test` function provided in `common.sh`.\n * The new script will be automatically included in the full test suite run.\n * Ensure coverage for positive matches (should save) and negative matches (should not save).\n\n### Docker Environment\nThe `.tests/Dockerfile` sets up a Debian environment with `exim4-daemon-light`. It mocks necessary lookup files (e.g., `.realmail`, `.denydomain`) to ensure tests run without missing file errors.\n\n## Refactoring Guidelines\n\n### Exim Filters\n* **Consolidation:** Group similar rules together. If multiple senders map to the same target folder, use a single `if` block with `or` operators.\n * *Example:* `if $h_From: contains \"A\" or $h_From: contains \"B\" then save ... endif`\n* **Header Checks:** When checking for contacts, consider checking `$h_From:`, `$h_To:`, and `$h_CC:` simultaneously if applicable.\n* **Syntax:** Ensure strictly valid Exim filter syntax.\n\n## Directory Structure\n* `randomness.org.uk/mailboxes/bob/forward`: Main Exim filter file.\n* `.tests/run-tests.sh`: Host-side test runner.\n* `.tests/run-internal-tests.sh`: Container-side test runner.\n* `.tests/test-*.sh`: Individual test suites."
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}
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}
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}
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],
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"status": "success",
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"timestamp": "2026-02-01T19:23:57.735Z",
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"resultDisplay": "",
|
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"displayName": "ReadFile",
|
||||
"description": "Reads and returns the content of a specified file. If the file is large, the content will be truncated. The tool's response will clearly indicate if truncation has occurred and will provide details on how to read more of the file using the 'offset' and 'limit' parameters. Handles text, images (PNG, JPG, GIF, WEBP, SVG, BMP), audio files (MP3, WAV, AIFF, AAC, OGG, FLAC), and PDF files. For text files, it can read specific line ranges.",
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"renderOutputAsMarkdown": true
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},
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{
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"id": "read_file-1769973837286-064c011a8044d",
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"name": "read_file",
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"args": {
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"file_path": ".tests/run-tests.sh"
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},
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"result": [
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{
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"functionResponse": {
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"id": "read_file-1769973837286-064c011a8044d",
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"name": "read_file",
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"response": {
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"output": "#!/bin/bash\n\n# Ensure we are running from the project root\ncd \"$(dirname \"$0\")/..\"\n\n# Build the test container\necho \"Building test image...\"\n# Use -f to point to the Dockerfile in .tests/\n# Use . as the context so we can access randomness.org.uk and .tests/\ndocker build -t sympl-config-tests -f .tests/Dockerfile .\n\n# Run the tests\necho \"Running tests...\"\ndocker run --rm sympl-config-tests /tests/run-internal-tests.sh \"$@\""
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}
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}
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}
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],
|
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"status": "success",
|
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"timestamp": "2026-02-01T19:23:57.735Z",
|
||||
"resultDisplay": "",
|
||||
"displayName": "ReadFile",
|
||||
"description": "Reads and returns the content of a specified file. If the file is large, the content will be truncated. The tool's response will clearly indicate if truncation has occurred and will provide details on how to read more of the file using the 'offset' and 'limit' parameters. Handles text, images (PNG, JPG, GIF, WEBP, SVG, BMP), audio files (MP3, WAV, AIFF, AAC, OGG, FLAC), and PDF files. For text files, it can read specific line ranges.",
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"renderOutputAsMarkdown": true
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},
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{
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"id": "read_file-1769973837488-8e9c5cbe7170e8",
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"name": "read_file",
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"args": {
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"file_path": ".tests/common.sh"
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},
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"result": [
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{
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"functionResponse": {
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"id": "read_file-1769973837488-8e9c5cbe7170e8",
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"name": "read_file",
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"response": {
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"output": "#!/bin/bash\n\n# Shared configuration and functions for Exim filter tests\n\n# Define the full path to the Exim executable\nEXIM_COMMAND=\"/usr/sbin/exim\"\n\n# Function to run a test\nrun_test() {\n local TEST_NAME=\"$1\"\n local TEST_EMAIL_CONTENT=\"$2\"\n local EXPECTED_OUTPUT=\"$3\"\n local SKIP=\"${4:-false}\"\n\n if [ \"$SKIP\" = \"true\" ]; then\n if [ \"$VERBOSE\" = \"true\" ]; then\n echo \"⏭️ SKIPPED: $TEST_NAME (TODO: Fix this test)\"\n echo \"\"\n fi\n echo \"skipped\" >> /tmp/test_results.txt\n return\n fi\n\n if [ \"$VERBOSE\" = \"true\" ]; then\n echo \"▶️ Testing: $TEST_NAME\"\n fi\n \n if [ ! -x \"$EXIM_COMMAND\" ]; then\n echo \"⚠️ Skipping execution (Exim not found at $EXIM_COMMAND)\"\n echo \"\"\n echo \"skipped\" >> /tmp/test_results.txt\n return\n fi\n\n echo \"$TEST_EMAIL_CONTENT\" | \"$EXIM_COMMAND\" -bF \"$FILTER_FILE\" > /tmp/exim_test_output 2>&1\n\n if grep -qF \"$EXPECTED_OUTPUT\" /tmp/exim_test_output; then\n if [ \"$VERBOSE\" = \"true\" ]; then\n echo \"✅ PASS\"\n echo \"\"\n fi\n echo \"passed\" >> /tmp/test_results.txt\n else\n # If not verbose, we haven't printed the test name yet, so do it now\n if [ \"$VERBOSE\" != \"true\" ]; then\n echo \"▶️ Testing: $TEST_NAME\"\n fi\n echo \"❌ FAIL\"\n echo \"--- Exim Output ---\"\n cat /tmp/exim_test_output\n echo \"--- End of Exim Output ---\"\n echo \"failed\" >> /tmp/test_results.txt\n echo \"\"\n fi\n}\n\n# Common initialization\ninit_tests() {\n local DEFAULT_FILTER_FILE=\"$1\"\n FILTER_FILE=\"${2:-$DEFAULT_FILTER_FILE}\"\n\n # Check if the filter file exists\n if [ ! -f \"$FILTER_FILE\" ]; then\n echo \"Error: Exim filter file not found at '$FILTER_FILE'.\"\n exit 1\n fi\n}"
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}
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}
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}
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],
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"status": "success",
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"timestamp": "2026-02-01T19:23:57.735Z",
|
||||
"resultDisplay": "",
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||||
"displayName": "ReadFile",
|
||||
"description": "Reads and returns the content of a specified file. If the file is large, the content will be truncated. The tool's response will clearly indicate if truncation has occurred and will provide details on how to read more of the file using the 'offset' and 'limit' parameters. Handles text, images (PNG, JPG, GIF, WEBP, SVG, BMP), audio files (MP3, WAV, AIFF, AAC, OGG, FLAC), and PDF files. For text files, it can read specific line ranges.",
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"renderOutputAsMarkdown": true
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||||
},
|
||||
{
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"id": "read_file-1769973837659-5059f3b113d4b8",
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"name": "read_file",
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"args": {
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"file_path": ".tests/test-spam.sh"
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},
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"result": [
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{
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"functionResponse": {
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"id": "read_file-1769973837659-5059f3b113d4b8",
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"name": "read_file",
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"response": {
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"output": "#!/bin/bash\nSCRIPT_DIR=\"$(dirname \"$0\")\"\nsource \"$SCRIPT_DIR/common.sh\"\ninit_tests \"/srv/randomness.org.uk/mailboxes/bob/.forward\" \"$1\"\n\nif [ \"$VERBOSE\" = \"true\" ]; then\n echo \"--- Running Spam and Security Filtering Tests ---\"\nfi\n\nrun_test 'Test: $h_X-Spam-Flag: contains YES' \\\n\"From: spammer@example.com\nTo: bob@randomness.org.uk\nSubject: Spam Test\nX-Spam-Flag: YES\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $h_X-Spam-Status: contains spam' \\\n\"From: spammer@example.com\nTo: bob@randomness.org.uk\nSubject: Spam Test\nX-Spam-Status: Yes, score=10.0 required=5.0 spam\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $h_X-Spam-Bar: contains +++' \\\n\"From: spammer@example.com\nTo: bob@randomness.org.uk\nSubject: Possible Spam\nX-Spam-Bar: +++\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.possiblespam/\"\n\nrun_test 'Test: $h_Subject: contains martinch' \\\n\"From: notspam@example.com\nTo: bob@randomness.org.uk\nSubject: The Martinch Report\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $h_From: contains samsung-part.ru' \\\n\"From: parts@samsung-part.ru\nTo: bob@randomness.org.uk\nSubject: A spam message\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $h_From: contains .best' \\\n\"From: deals@bestdeals.best\nTo: bob@randomness.org.uk\nSubject: Amazing new offer\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $message_body contains firebasestorage.googleapis.com' \\\n\"From: test@example.com\nTo: bob@randomness.org.uk\nSubject: Important update\nContent-Type: text/plain\n\nPlease click this link: https://firebasestorage.googleapis.com/...\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\"\n\nrun_test 'Test: $sender_host_address is 91.227.220.14' \\\n\"Received: from [91.227.220.14] by mail.randomness.org.uk\nFrom: malicious@malware.org\nTo: bob@randomness.org.uk\nSubject: Important\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\" \\\n\"true\" # TODO: Fix this test\n\nrun_test 'Test: $sender_helo_name spoofing randomness.org.uk' \\\n\"Received: from randomness.org.uk ([1.2.3.4]) by mail.randomness.org.uk\nFrom: bob@randomness.org.uk\nTo: bob@randomness.org.uk\nSubject: Spoofing test\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.spamfakes/\" \\\n\"true\" # TODO: Fix this test\n\nrun_test 'Test: $h_From: contains postmaster@' \\\n\"From: postmaster@example.com\nTo: bob@randomness.org.uk\nSubject: Delivery failure\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.postmaster/\"\n\nrun_test 'Test: $h_From: contains MAILER-DAEMON' \\\n\"From: MAILER-DAEMON@example.com\nTo: bob@randomness.org.uk\nSubject: Undeliverable\" \\\n\"Save message to: /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.postmaster/\""
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}
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}
|
||||
}
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],
|
||||
"status": "success",
|
||||
"timestamp": "2026-02-01T19:23:57.735Z",
|
||||
"resultDisplay": "",
|
||||
"displayName": "ReadFile",
|
||||
"description": "Reads and returns the content of a specified file. If the file is large, the content will be truncated. The tool's response will clearly indicate if truncation has occurred and will provide details on how to read more of the file using the 'offset' and 'limit' parameters. Handles text, images (PNG, JPG, GIF, WEBP, SVG, BMP), audio files (MP3, WAV, AIFF, AAC, OGG, FLAC), and PDF files. For text files, it can read specific line ranges.",
|
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"renderOutputAsMarkdown": true
|
||||
}
|
||||
],
|
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"thoughts": [
|
||||
{
|
||||
"subject": "Analyzing Blog Post Requirements",
|
||||
"description": "I'm currently breaking down the user's request for a blog post. I've noted the need to describe Exim filter testing, focusing on the Docker-based setup. I need to figure out how to best structure the post, ensuring clarity and also protecting sensitive information. Anonymization of code samples seems crucial.",
|
||||
"timestamp": "2026-02-01T19:23:55.615Z"
|
||||
},
|
||||
{
|
||||
"subject": "Reviewing Test Infrastructure Details",
|
||||
"description": "I've dived into the specifics of the Exim filter testing. I'm focusing on the Docker-based infrastructure as described in `GEMINI.md` and studying the `run-tests.sh` script to understand the test execution flow. I am also planning on reviewing the main filter to identify and anonymize the code samples. This step is necessary before any writing can occur.",
|
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"timestamp": "2026-02-01T19:23:56.857Z"
|
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}
|
||||
],
|
||||
"model": "gemini-3-flash-preview",
|
||||
"tokens": {
|
||||
"input": 14840,
|
||||
"output": 66,
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||||
"cached": 0,
|
||||
"thoughts": 202,
|
||||
"tool": 0,
|
||||
"total": 15108
|
||||
}
|
||||
},
|
||||
{
|
||||
"id": "d089d321-fc24-4595-8f7d-ee734a4be3d2",
|
||||
"timestamp": "2026-02-01T19:24:02.681Z",
|
||||
"type": "gemini",
|
||||
"content": "",
|
||||
"toolCalls": [
|
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{
|
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"id": "read_file-1769973842665-173e7cea104bf",
|
||||
"name": "read_file",
|
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"args": {
|
||||
"file_path": "randomness.org.uk/mailboxes/bob/forward",
|
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"limit": 50
|
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},
|
||||
"result": [
|
||||
{
|
||||
"functionResponse": {
|
||||
"id": "read_file-1769973842665-173e7cea104bf",
|
||||
"name": "read_file",
|
||||
"response": {
|
||||
"output": "\nIMPORTANT: The file content has been truncated.\nStatus: Showing lines 1-50 of 492 total lines.\nAction: To read more of the file, you can use the 'offset' and 'limit' parameters in a subsequent 'read_file' call. For example, to read the next section of the file, use offset: 50.\n\n--- FILE CONTENT (truncated) ---\n#Exim Filter\nif $header_content-type: contains \"iso-2022-jp\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_X-Spam-Flag: contains \"YES\" and not delivered\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_Subject: contains \"martinch\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_From: contains \"samsung-part.ru\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_From: contains \"noreply@asahi.com\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_From: contains \"nfpsend1.co.uk\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\n\nif $h_From: contains \"firebaseapp.com\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\nif $h_From: contains \".best\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\nif $h_From: contains \".help\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\nif $h_From: contains \".sa.com\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/\nendif\nif $h_From: contains \".za.com\"\nthen\nsave /srv/randomness.org.uk/mailboxes/bob/Maildir/.badpeople.caughtspam/"
|
||||
}
|
||||
}
|
||||
}
|
||||
],
|
||||
"status": "success",
|
||||
"timestamp": "2026-02-01T19:24:02.681Z",
|
||||
"resultDisplay": "Read lines 1-50 of 492 from randomness.org.uk/mailboxes/bob/forward",
|
||||
"displayName": "ReadFile",
|
||||
"description": "Reads and returns the content of a specified file. If the file is large, the content will be truncated. The tool's response will clearly indicate if truncation has occurred and will provide details on how to read more of the file using the 'offset' and 'limit' parameters. Handles text, images (PNG, JPG, GIF, WEBP, SVG, BMP), audio files (MP3, WAV, AIFF, AAC, OGG, FLAC), and PDF files. For text files, it can read specific line ranges.",
|
||||
"renderOutputAsMarkdown": true
|
||||
}
|
||||
],
|
||||
"thoughts": [
|
||||
{
|
||||
"subject": "Outlining the Post",
|
||||
"description": "I'm finalizing the blog post outline. I've sketched out the introduction, which focuses on the complexities of email filter management. Then I've added notes on the technical setup: Sympl on a Mythic Beasts VM. Now I'm preparing to flesh out the main problem and solution sections.",
|
||||
"timestamp": "2026-02-01T19:24:01.692Z"
|
||||
},
|
||||
{
|
||||
"subject": "Preparing to Write",
|
||||
"description": "I'm feeling confident about the post content now. I've reviewed the outline and feel ready to start writing. I'll make sure to mention the importance of maintaining an up-to-date `.forward` file. I'm also going to check the example test code, and then I should be ready to start crafting the main body of the article.",
|
||||
"timestamp": "2026-02-01T19:24:02.453Z"
|
||||
}
|
||||
],
|
||||
"model": "gemini-3-flash-preview",
|
||||
"tokens": {
|
||||
"input": 17304,
|
||||
"output": 25,
|
||||
"cached": 13140,
|
||||
"thoughts": 182,
|
||||
"tool": 0,
|
||||
"total": 17511
|
||||
}
|
||||
},
|
||||
{
|
||||
"id": "4a6dffc8-486d-4873-8b12-89131d989d51",
|
||||
"timestamp": "2026-02-01T19:24:11.470Z",
|
||||
"type": "gemini",
|
||||
"content": "# Testing My Exim Filter with Docker\n\nManaging complex email filters can be a nerve-wracking experience. One wrong rule in your `.forward` file, and you might accidentally drop important emails or let a flood of spam through.\n\nFor my setup, I run [Sympl](https://sympl.host/) on a [Mythic Beasts VM](https://www.mythic-beasts.com/). It's a rock-solid combination that makes managing multiple domains a breeze, but as my Exim filter rules grew to hundreds of lines, I needed a way to test them before \"deploying\" to production.\n\n## The Strategy\n\nThe goal was simple: provide an automated way to verify that specific email headers or body content correctly trigger the expected filter actions (like saving to a specific folder).\n\nI settled on a Docker-based testing infrastructure. This allows me to simulate an Exim environment without messing with my actual mail server.\n\n## How it Works\n\nThe heart of the testing system is a small Docker container that installs `exim4-daemon-light`.\n\n### 1. The Test Runner\nI have a host-side script, `.tests/run-tests.sh`, which builds the Docker image and runs the internal test suite.\n\n```bash\n#!/bin/bash\n# .tests/run-tests.sh\ndocker build -t sympl-config-tests -f .tests/Dockerfile .\ndocker run --rm sympl-config-tests /tests/run-internal-tests.sh \"$@\"\n```\n\n### 2. The Internal Logic\nInside the container, I use Exim's own \"filter testing\" mode: `exim -bF <filter_file>`. By piping a mock email into this command, Exim tells exactly what it *would* have done with that message.\n\nI wrote a small helper function in `common.sh` to make defining tests easy:\n\n```bash\nrun_test() {\n local TEST_NAME=\"$1\"\n local TEST_EMAIL_CONTENT=\"$2\"\n local EXPECTED_OUTPUT=\"$3\"\n\n echo \"$TEST_EMAIL_CONTENT\" | exim -bF \"$FILTER_FILE\" > /tmp/output 2>&1\n\n if grep -qF \"$EXPECTED_OUTPUT\" /tmp/output; then\n echo \"✅ PASS: $TEST_NAME\"\n else\n echo \"❌ FAIL: $TEST_NAME\"\n cat /tmp/output\n fi\n}\n```\n\n### 3. Writing Test Cases\nNow I can write simple test scripts for different categories of filters. For example, verifying spam detection:\n\n```bash\n# .tests/test-spam.sh\nrun_test 'Spam Flag Detection' \\\n\"From: spammer@example.com\nTo: bob@example.com\nSubject: Win a prize!\nX-Spam-Flag: YES\" \\\n\"Save message to: /path/to/Maildir/.caughtspam/\"\n\nrun_test 'Specific Domain Block' \\\n\"From: sales@annoying-marketing.ru\nTo: bob@example.com\nSubject: Buy now\" \\\n\"Save message to: /path/to/Maildir/.caughtspam/\"\n```\n\n## Peace of Mind\n\nWith this setup, I can refactor my filter rules—consolidating similar blocks or tightening criteria—and run `./.tests/run-tests.sh -v` to ensure everything still works as expected.\n\nIf you're running Sympl or any Exim-based system on a [Mythic Beasts](https://www.mythic-beasts.com/) VM, I highly recommend setting up something similar. It turns \"I hope this works\" into \"I know this works.\"",
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"content": "# Testing Complex Exim Filters with Docker\n\nI run [Sympl](https://sympl.host/) on a [Mythic Beasts](https://www.mythic-beasts.com/) VM. As my mail filter rules (`.forward`) grew to hundreds of lines, manual verification became impossible. \n\nTo solve this, I built a Docker-based testing suite that simulates delivery without touching production mail.\n\n## The Approach\n\nThe system uses `exim4-daemon-light` inside a container and leverages Exim's filter testing mode (`-bF`).\n\n### 1. Mocking the Environment\nA `Dockerfile` sets up a minimal Debian environment with Exim and mock files for local lookups.\n\n### 2. The Test Helper\nI use a simple Bash function to pipe mock emails into Exim and check the resulting action:\n\n```bash\nrun_test() {\n local NAME=\"$1\"\n local CONTENT=\"$2\"\n local EXPECTED=\"$3\"\n\n echo \"$CONTENT\" | exim -bF \"$FILTER_FILE\" | grep -qF \"$EXPECTED\"\n # ... logic to report success/failure\n}\n```\n\n### 3. Example Test Case\nThis ensures that emails from known spam patterns are correctly routed to the spam folder:\n\n```bash\nrun_test 'Spam Domain Block' \\\n\"From: info@spamsite.best\nSubject: Urgent\" \\\n\"Save message to: /path/to/Maildir/.caughtspam/\"\n```\n\n## Benefits\nBy running `./.tests/run-tests.sh`, I can refactor complex rules with confidence, knowing exactly how Exim will handle specific headers and body content before the code ever goes live.\n",
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"fileDiff": "Index: blog-testing-exim-filters.md\n===================================================================\n--- blog-testing-exim-filters.md\tCurrent\n+++ blog-testing-exim-filters.md\tProposed\n@@ -0,0 +1,40 @@\n+# Testing Complex Exim Filters with Docker\n+\n+I run [Sympl](https://sympl.host/) on a [Mythic Beasts](https://www.mythic-beasts.com/) VM. As my mail filter rules (`.forward`) grew to hundreds of lines, manual verification became impossible. \n+\n+To solve this, I built a Docker-based testing suite that simulates delivery without touching production mail.\n+\n+## The Approach\n+\n+The system uses `exim4-daemon-light` inside a container and leverages Exim's filter testing mode (`-bF`).\n+\n+### 1. Mocking the Environment\n+A `Dockerfile` sets up a minimal Debian environment with Exim and mock files for local lookups.\n+\n+### 2. The Test Helper\n+I use a simple Bash function to pipe mock emails into Exim and check the resulting action:\n+\n+```bash\n+run_test() {\n+ local NAME=\"$1\"\n+ local CONTENT=\"$2\"\n+ local EXPECTED=\"$3\"\n+\n+ echo \"$CONTENT\" | exim -bF \"$FILTER_FILE\" | grep -qF \"$EXPECTED\"\n+ # ... logic to report success/failure\n+}\n+```\n+\n+### 3. Example Test Case\n+This ensures that emails from known spam patterns are correctly routed to the spam folder:\n+\n+```bash\n+run_test 'Spam Domain Block' \\\n+\"From: info@spamsite.best\n+Subject: Urgent\" \\\n+\"Save message to: /path/to/Maildir/.caughtspam/\"\n+```\n+\n+## Benefits\n+By running `./.tests/run-tests.sh`, I can refactor complex rules with confidence, knowing exactly how Exim will handle specific headers and body content before the code ever goes live.\n+\n",
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"newContent": "# Testing Complex Exim Filters with Docker\n\nI run [Sympl](https://sympl.host/) on a [Mythic Beasts](https://www.mythic-beasts.com/) VM. As my mail filter rules (`.forward`) grew to hundreds of lines, manual verification became impossible. \n\nTo solve this, I built a Docker-based testing suite that simulates delivery without touching production mail.\n\n## The Approach\n\nThe system uses `exim4-daemon-light` inside a container and leverages Exim's filter testing mode (`-bF`).\n\n### 1. Mocking the Environment\nA `Dockerfile` sets up a minimal Debian environment with Exim and mock files for local lookups.\n\n### 2. The Test Helper\nI use a simple Bash function to pipe mock emails into Exim and check the resulting action:\n\n```bash\nrun_test() {\n local NAME=\"$1\"\n local CONTENT=\"$2\"\n local EXPECTED=\"$3\"\n\n echo \"$CONTENT\" | exim -bF \"$FILTER_FILE\" | grep -qF \"$EXPECTED\"\n # ... logic to report success/failure\n}\n```\n\n### 3. Example Test Case\nThis ensures that emails from known spam patterns are correctly routed to the spam folder:\n\n```bash\nrun_test 'Spam Domain Block' \\\n\"From: info@spamsite.best\nSubject: Urgent\" \\\n\"Save message to: /path/to/Maildir/.caughtspam/\"\n```\n\n## Benefits\nBy running `./.tests/run-tests.sh`, I can refactor complex rules with confidence, knowing exactly how Exim will handle specific headers and body content before the code ever goes live.\n\n",
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"content": "# Testing & Refactoring Exim Filters with Docker\n\nI run [Sympl](https://sympl.host/) on a [Mythic Beasts](https://www.mythic-beasts.com/) VM. My mail filter (`.forward`) had grown into a massive, repetitive file that was begging for a refactor, but I was terrified of breaking my mail delivery.\n\nTo solve this, I built a Docker-based testing suite to verify my rules before making changes.\n\n## The Testing Strategy\n\nThe system uses `exim4-daemon-light` inside a container and leverages Exim's filter testing mode (`exim -bF`). I wrote a simple Bash helper to pipe mock emails into Exim and verify the output:\n\n```bash\nrun_test 'Spam Domain Block' \\\n\"From: info@spamsite.best\nSubject: Urgent\" \\\n\"Save message to: /path/to/Maildir/.caughtspam/\"\n```\n\n## Refactoring with Gemini CLI\n\nWith a solid test suite in place, I used **[gemini-cli](https://github.com/google/gemini-cli)** to handle the heavy lifting. It helped me:\n- Consolidate hundreds of repetitive `if` blocks into cleaner `or` conditions.\n- Standardize header checks across the entire file.\n- Generate new test cases for edge cases I hadn't covered.\n\nThe combination of a local test suite and an AI-powered CLI turned a high-risk manual chore into a safe, automated workflow. Now I can refactor with confidence, knowing my mail is still going where it should.\n",
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Reference in New Issue
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