Dear Paul,

thank you for your comment.

Am 25.05.2025 um 20:01 schrieb Paul Zirnik via dovecot:
For dovecot i think you need to strip the domain

protocol lmtp {
   auth_username_format = %{user | username}
}

If i understand the docs, the setting in 10-auth

auth_username_format = %Ln

sets the username to lowercase and strips the domain. As it is not contained in any environment, i regarded it as global. Is it really necessary to repeat it for protocol lmtp?

For postfix i think you need to add your domain to mydestination

mydestination = $myhostname, $mydomain        # i also add localhost.$mydomain, 
localhost

That seems wrong. virtual_alias_domains = $mydomain, and the postfix docs warn explicitly to use mydestination for any virtual_alias_domain or virtual_mailbox_domain.

Kind regards,
QNo

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