Perfecto, solved.

Thank you very much!

When i send email from webmail roundcube i get:
SMTP-failure (451): Receiver "receiver@gmail.com" can't be added (4.3.0 <receiver@gmail.com>: Temporary lookup failure).

Hey Florian,

Thanks for the quick reply.

skip_name_resolve > also came on that topic.

But trying to find it in the config. all the config files inside /etc/mysql/ don't have this line.

Any idea?

EDIT:
50-server.cnf inside /etc/mysql/mariadb.conf.d has this line, but already commented.

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