added sieve example for subaddress sorting

[mpldr]

Description

This just adds an example on how to automatically sort incoming mails, based on their subaddresses. I use this filter myself and thought it might be of interest to people setting up their sieves.

Type of change

• Documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (README.md or the documentation under docs/)
• New and existing unit tests pass locally with my changes

[casperklein]

Good contribution 👍

[wernerfred]

Thank you for your first contribution 🚀

One question: Will this also work if you use another delimiter or would you need to adjust something?

[mpldr]

On Tue Feb 15, 2022 at 9:05 PM CET, Frederic Werner wrote: One question: Will this also work if you use another delimiter or would you need to adjust something?

If you use a different path separator, you need to change that. -- Moritz Poldrack https://moritz.sh

[mpldr]

I am also not aware of a way to automatically switch.

[wernerfred]

I do not mean the delimiter option on the dms in general but in your sieve code snippert. Can't see where it matches to + (which could be changed). Or will this sieve snippet also work if someone configured dms to use another delimiter out of the box

[mpldr]

On that I am actually not too sure. If I read the docs correctly, the `require subaddress` *should* take care of it.

[github-actions]

Documentation preview for this PR is ready! 🎉

Built with commit: b2d0379