On 7/04/24 02:34, lua8ds--- via dovecot wrote:
When a sender writes my email address with my username uppercase, e.g.
usern...@name.com, in the to: field of their MUA, my mail server rejects that
email. /var/log/mail.log prints:
<usern...@redacted.com>: host mail.redacted.com[private/dovecot-lmtp] said:
550 5.1.1
> <usern...@redacted.com> User doesn't exist: usern...@redacted.com (in
reply to RCPT TO
> command)
In the manual, I found that:
auth_username_format
auth_username_format is for the authentication backend and has nothing
to do with receiving mail. You want to change the args line under
userdb, add an "L" modifier to username_format, so something like:
args = username_format=%Ln ...
Alternatively you can probably configure your MTA to lowercase the
username before it passes the message off to dovecot.
Peter
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