On 06/04/2024 17:34 EEST lua8ds--- via dovecot <dovecot@dovecot.org>
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
Default: %Lu
Formatting applied to username before querying the auth database.
You can use the standard variables here.
Examples:
%Lu
Lowercases the username
[...]
My current setting was not the default; I had:
auth_username_format = %n
So I updated that setting to:
auth_username_format = %Lu
expecting that %Lu would lowercase the username - and that my problem
would be fixed.
It does not though. Updating this setting not only prompts my email
server to still reject usern...@redacted.com, but now also rejects
(lowercase username) usern...@redacted.com (which my server had no
issue receiving beforehand).
So I reverted auth_username_format to:
auth_username_format = %n
Emails sent to usern...@redacted.com land in my mailbox again - but
emails sent to usern...@redacted.com still don't.
What can I try to troubleshoot?
Which config file shall I share with you?
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Did you try %Ln?
Aki
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