Quoting David Mehler <dave.meh...@gmail.com>:

Hello,

 I've got a new horde webmail install going on a FreeBSD 11.1 jail.
 I've got Dovecot set up so that it appends a domain name if one is not
 given, so that user and u...@example.com can both log in. The Dovecot
server handles imap authentication as well as smtp authentication from
postfix. Dovecot in turn gets its authentication via a MySQL database.

 When I logged in with horde webmail I used for the first attempt
 username with no @example.com suffix. I logged in ok, but couldn't
 send an email, gave me a weird error no address associated with host.
 I logged out, logged back in using u...@example.com the full address,
 and this time the message sending went through.

Just because you told Dovecot (your IMAP server) to append the domain, doesn't mean that Postfix will know about it. You need to do one of the following: (A) configure Horde to automatically append the domain, (B) Configure a proper From address in the user's identity, or possibly (C) configure Postfix to append a domain.

As an aside, allowing both user and u...@example.com to login can lead to unexpected problems related to things like the preference system is you are not careful and use an appropriate username hook.



I could provide Dovecot, Postfix, and/or Horde Webmail configurations,
but didn't want to include them all without knowing where this issue
most likely resided. If it matters the web server is Apache 2.4.

Thanks.
Dave.
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