{"id":31650463,"url":"https://github.com/open-technology-foundation/mailheader","last_synced_at":"2025-10-07T08:29:57.295Z","repository":{"id":318398067,"uuid":"1070020822","full_name":"Open-Technology-Foundation/mailheader","owner":"Open-Technology-Foundation","description":"Very fast email parsing utilities for extracting headers and message bodies. 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Available as both standalone binaries and bash loadable builtins.\n\n## Purpose and Use Cases\n\nThese utilities solve common email processing challenges in scripts and automation:\n\n**Use Cases:**\n- **Email archival**: Strip bloat headers before archiving to reduce storage by ~20% (mailheaderclean)\n- **Email parsing**: Extract sender, subject, dates from mailbox files (mailheader + parsing)\n- **Mailbox processing**: Process thousands of emails efficiently with bash builtins (10-20x faster)\n- **Email splitting**: Separate headers from body for independent processing\n- **Privacy**: Remove tracking headers and metadata before forwarding emails\n- **Thunderbird integration**: Clean emails while preserving client-specific headers\n- **Batch operations**: Clean entire directories of emails in-place\n\n**Why these tools?**\n- **Performance**: Bash builtins eliminate fork/exec overhead (~1-2ms → ~0.1ms per call)\n- **Simplicity**: Single-purpose utilities that do one thing well\n- **RFC 822 compliance**: Proper handling of header continuation lines\n- **Flexibility**: Dual implementation (binaries + builtins) for different contexts\n- **No dependencies**: Pure C, minimal external requirements\n\n**Comparison with alternatives:**\n- **vs formail/reformail**: Focused specifically on header/body extraction and cleaning\n- **vs python/perl**: No interpreter overhead, much faster for batch processing\n- **vs awk/sed**: Built-in RFC 822 support, easier to use correctly\n\n## Utilities\n\n### mailheader\nExtracts email headers (everything up to the first blank line).\n\n- Handles RFC 822 continuation lines (joins lines starting with whitespace)\n- Normalizes formatting (removes `\\r`, converts tabs to spaces)\n- Available as binary and builtin\n\n```bash\nmailheader email.eml\nmailheader -h          # Show help\n```\n\n### mailmessage\nExtracts email message body (everything after the first blank line).\n\n- Skips the header section entirely\n- Preserves message formatting\n- Available as binary and builtin\n\n```bash\nmailmessage email.eml\nmailmessage -h         # Show help\n```\n\n### mailheaderclean\nFilters non-essential email headers from complete email files.\n\n- Removes ~207 bloat headers (Microsoft Exchange, security vendors, tracking, etc.)\n- Keeps only the first \"Received\" header\n- Preserves essential routing headers and complete message body\n- Supports flexible header filtering via environment variables\n- Available as binary and builtin\n\n```bash\nmailheaderclean email.eml \u003e cleaned.eml\nmailheaderclean -h                        # Show help\n```\n\n**Environment variables:**\n- `MAILHEADERCLEAN`: Replace entire removal list with custom headers\n- `MAILHEADERCLEAN_PRESERVE`: Exclude specific headers from removal (e.g., for Thunderbird features)\n- `MAILHEADERCLEAN_EXTRA`: Add additional headers to the built-in removal list\n\n### mailgetaddresses\nExtracts email addresses from From, To, and Cc headers in email files.\n\n- Handles various email formats (with/without names, quoted strings, etc.)\n- Multiple recipients per header\n- Optional output formatting (with names, separated by header type)\n- Selective header extraction\n- Accepts multiple files and/or directories as arguments\n- Processes all files in given directories\n- Directory exclusions (default: .Junk, .Trash, .Sent) with override support\n- **Name cleaning**: Decodes RFC 2047 encoded names, removes quotes and parenthetical notation\n- Removes redundant names (when name equals email address)\n\n```bash\nmailgetaddresses email.eml                      # Extract from single file\nmailgetaddresses -n email.eml                   # Include names with addresses\nmailgetaddresses -s email.eml                   # Separate by header type\nmailgetaddresses -H from,to email.eml           # Extract only From and To\nmailgetaddresses file1.eml file2.eml file3.eml  # Multiple files\nmailgetaddresses /path/to/maildir/              # Process directory (excludes .Junk,.Trash,.Sent)\nmailgetaddresses -x .spam,.Junk /path/to/mail/  # Custom directory exclusions\nmailgetaddresses --exclude '' /path/to/mail/    # No exclusions (process all subdirs)\nmailgetaddresses email.eml /path/to/maildir/    # Combine files and dirs\nmailgetaddresses /path/to/maildir/ | sort -fu   # Deduplicate (case-insensitive)\nmailgetaddresses -n /path/to/maildir/ | sort -fu \u003e contacts.txt  # Build contact list\nmailgetaddresses --help                         # Show help\n```\n\n**Name Cleaning Examples:**\n```bash\n# Input:  =?utf-8?Q?Undangan_Pelatihan?= \u003cinvite@example.com\u003e\n# Output: Undangan Pelatihan \u003cinvite@example.com\u003e\n\n# Input:  'John Doe' \u003cjohn@example.com\u003e\n# Output: John Doe \u003cjohn@example.com\u003e\n\n# Input:  Jane Smith (jane@example.com) \u003cjane@example.com\u003e\n# Output: Jane Smith \u003cjane@example.com\u003e\n\n# Input:  bob@test.com \u003cbob@test.com\u003e\n# Output: bob@test.com\n```\n\n### clean-email-headers\nProduction script for batch cleaning of email files or directories in-place.\n\n- Process single files or entire directories\n- Age filtering with `-d/--days` option\n- Configurable directory traversal depth\n- Preserves timestamps and permissions\n- Progress reporting and error handling\n\n```bash\nclean-email-headers email.eml              # Clean single file\nclean-email-headers /path/to/maildir       # Clean all files in directory\nclean-email-headers -d 7 /path/to/maildir  # Only files from last 7 days\nclean-email-headers -m 2 /path/to/maildir  # Traverse 2 levels deep\nclean-email-headers -h                     # Show help\n```\n\nAll utilities support:\n- **Help options**: `-h` or `--help` for usage information\n- **Consistent exit codes**: 0 (success), 1 (file error), 2 (usage error)\n- **Dual implementation**:\n  - Standalone binaries for general use\n  - Bash loadable builtins for high-performance scripting (10-20x faster)\n\n## Installation\n\n### Prerequisites\n\nFor the bash loadable builtin:\n```bash\nsudo apt-get install bash-builtins  # Ubuntu/Debian\n```\n\n### One-Liner Install\n\nQuick installation without keeping the source:\n\n```bash\ngit clone https://github.com/Open-Technology-Foundation/mailheader.git \u0026\u0026 cd mailheader \u0026\u0026 sudo ./install.sh --builtin \u0026\u0026 cd .. \u0026\u0026 rm -rf mailheader\n```\n\nThis will clone, install, and clean up the source in one command.\n\n### Getting the Source\n\nFor manual installation or to keep the source:\n\n```bash\ngit clone https://github.com/Open-Technology-Foundation/mailheader.git\ncd mailheader\n```\n\n**Optional**: Keep a system-wide copy of the source for future updates or rebuilds:\n\n```bash\n# Move to traditional source location (optional)\nsudo mv mailheader /usr/local/src/\ncd /usr/local/src/mailheader\n```\n\n**Note**: The source code is not required after installation. You can delete the cloned directory after running `install.sh` and re-clone from GitHub if needed later.\n\n### Quick Install (Recommended)\n\nUse the installation script for an interactive, automated installation:\n\n```bash\nsudo ./install.sh\n```\n\nThe script will:\n- Check prerequisites and build all utilities\n- Prompt whether to install the bash builtins (optional)\n- Install all files to the correct locations\n- Update the man database\n\n**Options:**\n```bash\nsudo ./install.sh --help              # Show all options\nsudo ./install.sh --builtin           # Force builtins (auto-installs dependencies)\nsudo ./install.sh --no-builtin        # Skip builtin installation\nsudo ./install.sh --uninstall         # Remove installation\nsudo ./install.sh --prefix=/opt       # Custom install location\nsudo ./install.sh --dry-run           # Preview without installing\n```\n\n**Note:** Using `--builtin` will automatically install the `bash-builtins` package if it's not already present (Debian/Ubuntu).\n\n### Manual Build and Install\n\nAlternatively, use make directly:\n\n```bash\n# Build all utilities\nmake\n\n# Install system-wide (requires sudo)\nsudo make install\n```\n\nThis installs:\n- Standalone binaries: `/usr/local/bin/{mailheader,mailmessage,mailheaderclean}`\n- Production script: `/usr/local/bin/clean-email-headers`\n- Loadable builtins: `/usr/local/lib/bash/loadables/{mailheader,mailmessage,mailheaderclean}.so`\n- Auto-load script: `/etc/profile.d/mail-tools.sh`\n- Manpages: `/usr/local/share/man/man1/{mailheader,mailmessage,mailheaderclean}.1`\n- Documentation: `/usr/local/share/doc/mailheader/`\n\n### Verify Installation\n\n```bash\n# Check standalone binaries\nwhich mailheader mailmessage mailheaderclean clean-email-headers\n\n# Check builtins (after opening new shell or sourcing profile)\nenable -a | grep mail\n\n# View help\nmailheader -h\nmailmessage -h\nmailheaderclean -h\nclean-email-headers -h\n\n# View manpages\nman mailheader\nman mailmessage\nman mailheaderclean\n\n# Get help for builtins\nhelp mailheader\nhelp mailmessage\nhelp mailheaderclean\n```\n\n## Usage\n\n### Interactive Shell\n\nThe builtins are automatically loaded in new bash sessions:\n```bash\nmailheader email.eml\nmailmessage email.eml\nmailheaderclean email.eml\n```\n\n### Scripts\n\nScripts must explicitly enable the builtins:\n```bash\n#!/bin/bash\nenable -f mailheader.so mailheader 2\u003e/dev/null || true\nenable -f mailmessage.so mailmessage 2\u003e/dev/null || true\nenable -f mailheaderclean.so mailheaderclean 2\u003e/dev/null || true\n\n# Extract headers\nmailheader /path/to/email.eml\n\n# Extract message body\nmailmessage /path/to/email.eml\n\n# Clean bloat headers from email\nmailheaderclean /path/to/email.eml \u003e cleaned.eml\n\n# Split an email into parts\nmailheader email.eml \u003e headers.txt\nmailmessage email.eml \u003e body.txt\n\n# Remove custom headers\nMAILHEADERCLEAN_EXTRA=\"X-Custom,X-Internal\" mailheaderclean email.eml\n```\n\n### Cron Jobs\n\nCron requires explicit setup:\n```bash\n# Method 1: Source profile\n*/15 * * * * bash -c 'source /etc/profile.d/mail-tools.sh; mailheader /path/to/email.eml'\n\n# Method 2: Explicit enable\n*/15 * * * * bash -c 'enable -f mailheader.so mailheader; mailheader /path/to/email.eml'\n\n# Method 3: Use standalone binary\n*/15 * * * * /usr/local/bin/mailheader /path/to/email.eml\n\n# Method 4: Use production script\n0 2 * * * /usr/local/bin/clean-email-headers -d 30 /var/mail/archive 2\u003e/var/log/email-clean.log\n```\n\n## Examples\n\n### Basic Usage\n\nGiven `test.eml`:\n```\nFrom: sender@example.com\nTo: recipient@example.com\nSubject: Test email with\n continuation line\nDate: Mon, 1 Jan 2025 12:00:00 +0000\n\nThis is the message body.\nIt can span multiple lines.\n```\n\nExtract headers:\n```bash\n$ mailheader test.eml\nFrom: sender@example.com\nTo: recipient@example.com\nSubject: Test email with continuation line\nDate: Mon, 1 Jan 2025 12:00:00 +0000\n```\n\nExtract message body:\n```bash\n$ mailmessage test.eml\nThis is the message body.\nIt can span multiple lines.\n```\n\nSplit email into components:\n```bash\n$ mailheader email.eml \u003e headers.txt\n$ mailmessage email.eml \u003e body.txt\n$ cat headers.txt body.txt  # Reconstruct email\n```\n\n### Cleaning Bloat Headers\n\nClean single file:\n```bash\n$ mailheaderclean email.eml \u003e cleaned.eml\n```\n\nUse custom removal list entirely:\n```bash\n$ MAILHEADERCLEAN=\"X-Spam-Status,Delivered-To\" mailheaderclean email.eml\n```\n\nPreserve specific headers (e.g., for Thunderbird):\n```bash\n$ MAILHEADERCLEAN_PRESERVE=\"List-Unsubscribe,X-Priority\" mailheaderclean email.eml\n```\n\nAdd custom headers to built-in list:\n```bash\n$ MAILHEADERCLEAN_EXTRA=\"X-Custom-Header,X-Internal\" mailheaderclean email.eml\n```\n\nComplex combination:\n```bash\n$ MAILHEADERCLEAN=\"DKIM-Signature,List-Unsubscribe\" \\\n  MAILHEADERCLEAN_PRESERVE=\"List-Unsubscribe\" \\\n  MAILHEADERCLEAN_EXTRA=\"X-Custom\" mailheaderclean email.eml\n# Result: Removes DKIM-Signature and X-Custom, preserves List-Unsubscribe\n```\n\n### Production Script Examples\n\nClean single file in-place:\n```bash\nclean-email-headers email.eml\n```\n\nClean entire directory:\n```bash\nclean-email-headers /path/to/maildir\n```\n\nClean only recent files (last 7 days):\n```bash\nclean-email-headers -d 7 /path/to/maildir\n```\n\nClean with custom depth and verbosity:\n```bash\nclean-email-headers -m 3 -v /path/to/maildir\n```\n\nQuiet mode for cron:\n```bash\nclean-email-headers -q /path/to/maildir\n```\n\n### Advanced Examples\n\nParse headers into associative array:\n```bash\n#!/bin/bash\nsource /usr/local/share/doc/mailheader/mailgetheaders\n\ndeclare -A Headers\nmailgetheaders Headers email.eml\n\ndeclare -p Headers\necho \"From: ${Headers[From]}\"\necho \"Subject: ${Headers[Subject]}\"\necho \"Date: ${Headers[Date]}\"\n```\n\nBulk email cleaning with progress:\n```bash\n#!/bin/bash\nenable -f mailheaderclean.so mailheaderclean 2\u003e/dev/null || true\n\nexport MAILHEADERCLEAN_PRESERVE=\"List-Unsubscribe,List-Post,X-Priority,Importance\"\n\nfor email in ~/Maildir/cur/*; do\n  mailheaderclean \"$email\" \u003e \"/tmp/cleaned/$(basename \"$email\")\"\ndone\n```\n\nEmail archive with storage savings:\n```bash\n#!/bin/bash\nenable -f mailheaderclean.so mailheaderclean 2\u003e/dev/null || true\n\ntotal_saved=0\nfor email in /var/mail/archive/*.eml; do\n  original_size=$(stat -c%s \"$email\")\n  mailheaderclean \"$email\" \u003e \"/archive/clean/$(basename \"$email\")\"\n  cleaned_size=$(stat -c%s \"/archive/clean/$(basename \"$email\")\")\n  saved=$((original_size - cleaned_size))\n  total_saved=$((total_saved + saved))\n  echo \"Saved $saved bytes on $(basename \"$email\")\"\ndone\necho \"Total saved: $total_saved bytes\"\n```\n\n## Exit Codes\n\nAll utilities follow standard Unix exit code conventions:\n\n- **0** - Success\n- **1** - File error (cannot open/read file)\n- **2** - Usage error (incorrect arguments)\n\nExamples:\n```bash\nmailheader email.eml\necho $?  # 0 (success)\n\nmailheader /nonexistent/file\necho $?  # 1 (file error)\n\nmailheader\necho $?  # 2 (usage error - missing argument)\n```\n\n## Performance\n\nThe bash builtins eliminate fork/exec overhead:\n\n- **Standalone binaries**: ~1-2ms per call (fork + exec + startup)\n- **Bash builtins**: ~0.1ms per call (in-process execution)\n\nFor scripts processing many emails, this provides **10-20x speedup**.\n\n### Benchmarking\n\nThe project includes comprehensive benchmarking tools to measure performance:\n\n```bash\n# Basic performance comparison\n./benchmark.sh\n\n# Detailed scaling analysis with multiple file counts\n./benchmark_detailed.sh\n```\n\nBoth scripts compare builtin vs standalone performance across different file counts. Results typically show:\n- **Small files (1-2KB)**: 15-20x speedup with builtins\n- **Large files (\u003e100KB)**: 8-12x speedup with builtins\n- **Overall**: 10-20x average speedup for typical email processing\n\n### Real-World Performance\n\nTesting with 632 real email files (8.3MB total):\n\n**mailheaderclean cleaning operation:**\n- **Standalone**: ~2.5 seconds\n- **Builtin**: ~0.15 seconds\n- **Speedup**: ~16x faster\n\n**Storage savings:**\n- Original size: 8.3MB\n- Cleaned size: 6.6MB\n- **Savings**: 1.7MB (~20% reduction)\n\n## Testing\n\nThe project includes a comprehensive test suite with **632 real email files** from various sources.\n\n### Running Tests\n\n```bash\ncd tests\n\n# Comprehensive tests (all 632 files)\n./test_all_mailheader.sh       # Test header extraction\n./test_all_mailmessage.sh      # Test message body extraction\n./test_all_mailheaderclean.sh  # Test header cleaning\n\n# Quick functionality tests\n./test_simple.sh                    # Basic functionality\n./test_builtin_vs_standalone.sh     # Verify identical output\n./validate_email_format.sh          # RFC 822 compliance\n\n# Environment variable tests\n./test_env_vars.sh\n./test_mailheaderclean.sh\n```\n\n### Test Results\n\nAll tests pass with 100% success rate on critical functionality:\n\n- ✓ **632/633** files produce valid header extraction\n- ✓ **632/633** files produce valid message extraction\n- ✓ **632/633** files produce valid cleaned output\n- ✓ **632/632** files maintain valid RFC 822 format after cleaning\n- ✓ **100%** identical output between standalone and builtin versions\n- ✓ All environment variable combinations work correctly\n\nSee `tests/README.md` for detailed test documentation.\n\n## Build Targets\n\n```bash\nmake                      # Build all utilities (both versions)\nmake all-mailheader       # Build mailheader only\nmake all-mailmessage      # Build mailmessage only\nmake all-mailheaderclean  # Build mailheaderclean only\nmake standalone           # Build all standalone binaries\nmake loadable             # Build all builtins\nmake clean                # Remove build artifacts\nsudo make install         # Install all utilities\nsudo make uninstall       # Remove all installed files\nmake help                 # Show all available targets\n```\n\n## How the Builtins Work\n\nThe builtins are automatically available in interactive shells via `/etc/profile.d/mail-tools.sh`:\n\n1. Sets `BASH_LOADABLES_PATH=/usr/local/lib/bash/loadables`\n2. Auto-loads builtins in interactive shells:\n   - `enable -f mailheader.so mailheader`\n   - `enable -f mailmessage.so mailmessage`\n   - `enable -f mailheaderclean.so mailheaderclean`\n3. Non-interactive contexts (scripts, cron) must explicitly enable them\n\nThe builtins seamlessly integrate with bash, appearing identical to native commands while providing significant performance benefits.\n\n## Project Structure\n\n```\n.\n├── mailheader.c                   # Standalone binary\n├── mailheader_loadable.c          # Bash builtin\n├── mailmessage.c                  # Standalone binary\n├── mailmessage_loadable.c         # Bash builtin\n├── mailheaderclean.c              # Standalone binary\n├── mailheaderclean_loadable.c     # Bash builtin\n├── mailheaderclean_headers.h      # Shared header removal list (~207 headers)\n├── clean-email-headers            # Production batch cleaning script\n├── mail-tools.sh                  # Profile script for auto-loading\n├── mailgetheaders                # Example bash function\n├── Makefile                       # Build system\n├── install.sh                     # Installation script\n├── benchmark.sh                   # Basic benchmarking\n├── benchmark_detailed.sh          # Detailed benchmarking\n├── *.1                            # Man pages\n└── tests/                         # Test suite (632 email files)\n    ├── test_all_*.sh              # Comprehensive tests\n    ├── test_*.sh                  # Functionality tests\n    └── test-data/                 # 632 real email files\n```\n\n## FAQ\n\n**Q: Do I need both the binaries and builtins?**\nA: The installation script installs both by default. Use binaries for general scripts and builtins for high-performance batch processing.\n\n**Q: Will this work with my maildir?**\nA: Yes, these tools work with any RFC 822 compliant email format, including Maildir, mbox, and individual .eml files.\n\n**Q: How do I customize which headers to remove?**\nA: Use the `MAILHEADERCLEAN_*` environment variables to control header filtering. See examples above.\n\n**Q: Are timestamps preserved when cleaning emails?**\nA: Yes, when using `clean-email-headers` script. For manual operations, use `touch -r` to preserve timestamps.\n\n**Q: Can I use this in production?**\nA: Yes, all utilities are production-ready with comprehensive testing and error handling. The test suite validates against 632 real-world emails.\n\n## License\n\nGNU General Public License v3.0 or later. See LICENSE file for details.\n\n## Contributing\n\nIssues and pull requests welcome at [github.com/Open-Technology-Foundation/mailheader](https://github.com/Open-Technology-Foundation/mailheader)\n\n## Credits\n\nDeveloped by the Open Technology Foundation for efficient email processing in bash environments.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopen-technology-foundation%2Fmailheader","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fopen-technology-foundation%2Fmailheader","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fopen-technology-foundation%2Fmailheader/lists"}