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Of all MTAs we’re reviewing, Postfix has the strongest emphasis on security. The likely reason is that it was created by Wietse Zweitze Venema , a prolific freeware security specialist. Sendmail cannot be considered a secure MTA. Moreover, Postfix was originally designed to mitigate the vulnerabilities associated with Sendmail. Exim is quite secure for most cases but loses to Postfix. A proper configuration of your Postfix MTA provides improved defenses against spam, abuse, and leakage of sensitive data. So i don't want to use EXIM as a MTA with VestaCP on Ubuntu. I want to remove exim  completely from my VestaCP control panel. I want to use Postfix/Dovecot RSPAMD as a AntiSPAM solutions . I will publish details in next tutorials  Check Exim Status # systemctl status exim # systemctl status exim4 Remove Frozen mail # exim -bp # exim -bpc # exim -bp | awk '/^ *[0-9]+[mhd]/{print "exim -Mrm " $3}' | bash Remove Completely  # sudo apt remove --auto-remove exim4 #...