what it says in the subject line! Mailbutler, which I would have used, does not work with Ventura. (as an aside, Apple has made it near-impossible to look up information about their Mail app, due to the fact that they have named it simply "Mail".)
no, I didn't want to make an exhaustive list of plugins. I wanted to find any plugins which would work with the Ventura version of Mail. specifically, in case, one which could allow read receipts. (I couldn't find out whether Mail has the read receipts feature by default. again, pretty much impossible to find out any info on Mail since it has such a generic name.)
Requesting read or delivery receipts is not supported by Apple Mail, though I believe there are unsupported ways of including requests in outgoing mail. Apple Mail ignores read receipt requests in incoming mail. This is as a privacy and anti spam measure.
what it says in the subject line! Mailbutler, which I would have used, does not work with Ventura. (as an aside, Apple has made it near-impossible to look up information about their Mail app, due to the fact that they have named it simply "Mail".)