Thunderbird-Sieve-Converter

This Python script converts Thunderbird email filter rules (from msgFilterRules.dat) to Sieve script format, which can be used with email systems supporting Sieve filtering, such as Roundcube.

Usage

python filter_converter.py /path/to/msgFilterRules.dat [output_file.sieve]

• The first argument is the path to the Thunderbird filter file (msgFilterRules.dat).
• The second argument (optional) specifies the output Sieve file. If omitted, it defaults to roundcube.sieve.

Common Bug to Watch Out For

When reviewing the generated Sieve script, please ensure the following header format is correct:

header :contains "<header>" "<value>"

• If the header contains more than one pair of quotation marks, for example, header :contains ""received"", this is incorrect.
• The script aims to clean and format headers correctly, but in case you encounter extra or misaligned quotes in the Sieve file, you may need to double-check the msgFilterRules.dat format or notify me of the issue.

Contributing

Feel free to open issues or submit pull requests if you have suggestions for improvements or find any bugs.

License

This project is licensed under the MIT License. See the LICENSE file for details.