Am Samstag, dem 06.04.2024 um 14:34 +0000 schrieb lua8ds--- via
dovecot:
> 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 [email protected], but now also rejects
> (lowercase username) [email protected] (which my server had no
> issue receiving beforehand).
> 
> So I reverted auth_username_format to:
>    auth_username_format = %n
> 
> Emails sent to [email protected] land in my mailbox again - but
> emails sent to [email protected] still don't.
> 
> What can I try to troubleshoot?
> Which config file shall I share with you?

Try %Ln. It should work for you.
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