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                        Using generic imap with unsecure SMTP server fails
Some servers do not request users to submit a username/pw. At minimum, this breaks inbox-auth. Possibly breaks sending emails too.
Can you add support for smtp without authentication when using imap?
What servers are they? In practice we have not encountered this configuration, since they are so susceptible to spammers.
It's a server behind a VPN, so not public to others.