Thank you Tom and Aleksander, I ran netstat -lnp just to make sure that there is no other service running on port 587, and in fact there's no one (OS installation is fresh, I don't have other MTAs installed). Since Tom can run Dovecot, I suspect that I missed some configuration. Or maybe it is necessary to enable the process to open lower ports like 587? Thank you anyway. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx