Am 25.03.2020 um 00:22 schrieb Sam Varshavchik:
Dovecot is an IMAP and POP3 server.
Port 587 is the submission MSA port. It is not used by IMAP and POP3
servers. It is used by SMTP servers.
I do not have direct familiarity with dovecot, but I can't think of any
reason why it will be listening on port 587. Do you know exactly what
you did to apparently make Dovecot attempt to listen on port 587, and
for which reason did you want Dovecot to do that?
https://doc.dovecot.org/admin_manual/submission_server/
Alexander
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