My apologies, I should have prepared a little more before opening this thread. I am not running ISPConfig, just Roundcube, Dovecot, MariaDB and...
I fixed it. I had my domain as the hostname and smtp server in the roundcube config file. But since roundcube and postfix are on the same server,...
Thank you for your reply. Yes, I tried several possible solutions, like excluding certain ssl-protocols, uncommenting lines in the postfix main...
I set up a mail server on Ubuntu 18 with Roundcube, Dovecot and Postfix. I can login to Roundcube and receive e-mails just fine, but when I try to...
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