mailcap is deprecated in Python 3.11 and will be removed in 3.13

[chayleaf]

Is your feature request related to a problem? Please describe.
See Python docs - mailcap module is deprecated

Describe the solution you'd like
Writing a custom mailcap file loader that doesn't rely on the standard library is a good solution. Additionally, I think a non-standard extension of loading mailcap from alot config dir or $XDG_CONFIG_DIR/mailcap would be a good idea.

Describe alternatives you've considered

1. Ditching mailcap files completely, opting for a mix of custom config (e.g. for html viewing) and mime associations (for opening files) and breaking backwards compatibility
2. Telling users to stay at Python 3.12 till the end of time

[pazz]

Unfortunately it seems you are right :D
Writing a custom viewer sounds like the least attractive option to me. We could just ship a copy of the latest mailcap module or indeed, use a local mapping instead of mailcaps. In the end this mainly requires a handler for html messages and a call to xdg-open for opening attachments..

[jelly]

FYI: Python 3.13 is about to be released this week