Sorry for being off topic, but why are you deciding to move to dovecot? I have the impression the trend is that everyone is moving
to
google/outlook?
In June 2023, we ran a poll, below is results of primary use of email, the requirement was imap/pop3 be an ISP or private server, if they used imap with or web interface to gmail, they were asked to select freemail, for what its worth, there was only about 900 votes, and 95% of them were from Oceania, Asia, SA, Canada, and select parts of Europe (IT, DE) there were only a handful from US though, who are pretty screwed with FISA and Stored Communications Act etc anyway so they likely don't care either way :)
Ahhh, mailman stripped the whole point of my reply, list didnt like inline image... but anyway... Freemail 10% Webmail 9% pop3 36% imap 48%
:) I already wanted to ask.
ps. I think these guys have had their best times https://zonecheck.org/ not really up to date info