I have Ubuntu 18.04 and ISPConfig Version: 3.1.15p3 running on a dedicated server. postfix and Dovecot are running but when I try to send an email in roundcube the email gets bounced back. Following are some of the /var/log/mail.log entries: Apr 28 14:35:05 kes postfix/smtps/smtpd[19212]: disconnect from localhost[::1] commands=0/0 Apr 28 14:35:05 kes postfix/smtps/smtpd[19212]: lost connection after CONNECT from localhost[::1] Apr 28 14:35:05 kes postfix/smtps/smtpd[19212]: SSL_accept error from localhost[::1]: lost connection Apr 28 14:35:05 kes postfix/smtps/smtpd[19212]: connect from localhost[::1] Apr 28 14:35:05 kes dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<oF1B5lmkpucAAAAAAAAAAAAAAAAAAAAB> Apr 28 14:35:05 kes dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<PVxB5lmk1pAAAAAAAAAAAAAAAAAAAAAB> Apr 28 14:34:38 kes dovecot: imap([email protected]): Logged out in=117 out=950 Apr 28 14:34:38 kes dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=::1, lip=::1, mpid=19129, secured, session=<Td+e5FmknOcAAAAAAAAAAAAAAAA AAAAB> Would appreciate help in this matter.
I don't know if it helps, but when I ran systemctl --state=failed I got the following: UNIT LOAD ACTIVE SUB DESCRIPTION * certbot.service loaded failed failed Certbot LOAD = Reflects whether the unit definition was properly loaded. ACTIVE = The high-level unit activation state, i.e. generalization of SUB. SUB = The low-level unit activation state, values depend on unit type. 1 loaded units listed. Pass --all to see loaded but inactive units, too. To show all installed unit files use 'systemctl list-unit-files'.
There is tutorial: https://www.howtoforge.com/how-to-install-an-email-server-with-ispconfig-on-debian-10/
