Re: Uppercase username emails are rejected

I fixed the problem I had.

My mail server no longer rejects emails I receive to my username written in large cap e.g. USERNAME@DOMAIN.COM.

In the file /etc/dovecot/conf.d/10-auth.conf I had:

    auth_username_format = %n

I updated that line to:

    auth_username_format = %Ln

which, I understand, lowercase the username.

Also, before I updated the above file, I had fiddled with conf.d/auth-passwdfile.conf.ext which was then different from the configuration I found there:

https://doc.dovecot.org/2.3/configuration_manual/basic_configuration/

Mine was:

    passdb {
      driver = passwd-file
      args = scheme=CRYPT username_format=%u /etc/dovecot/users
    }
    userdb {
      driver = passwd-file
      args = username_format=%Lu /etc/dovecot/users # I have an extra 'L' here
    }

so I reverted the penultimate line to:

    args = username_format=%u /etc/dovecot/users

thank you all for your help.