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To increase security and reduce the number of unwanted messages, which includes spam, you can restrict Chat message requests from unknown senders in 1:1 conversations and spaces. On your computer,
based around dovecot, but has the basic structure
This might be useful to let some less-certain spam detection to put things into the Spam folder, but hide the more obvious stuff completely.
You can upload your own certificate.
I just put addresses in the file specified by check_recipient_access with REJECT
getting mail lists and DKIM to play together
requires Linux and runs DNS and Postfix in a Docker node
finishes with Dovecot info, not Cyrus Sieve
