Hi, first of all, I followed this howto: https://www.howtoforge.com/tutorial...-9-stretch-apache-bind-dovecot-ispconfig-3-1/ I installed about 50 websites and then I noticed the emails are not working. I can see them in the queue but nothing comes out. When I do a postqueue -p, I notice there are some messages: (delivery temporarily suspended: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused) I got nothing in logs. No error messages. Any clue ? root@ns3014956:~# dpkg -S `which sendmail` postfix: /usr/sbin/sendmail root@ns3014956:~# postqueue -f postqueue: fatal: Cannot flush mail queue - mail system is down root@ns3014956:~# service amavis status ● amavis.service - LSB: Starts amavisd-new mailfilter Loaded: loaded (/etc/init.d/amavis; generated; vendor preset: enabled) Active: active (running) since Fri 2018-08-24 16:21:05 UTC; 9min ago [...] 451 4.3.0 Error: queue file write error root@ns3014956:~# service clamav-daemon status ● clamav-daemon.service - Clam AntiVirus userspace daemon Loaded: loaded (/lib/systemd/system/clamav-daemon.service; enabled; vendor preset: enabled) Drop-In: /etc/systemd/system/clamav-daemon.service.d └─extend.conf Active: active (running) since Fri 2018-08-24 16:20:52 UTC; 10min ago root@ns3014956:~# service postfix status ● postfix.service - Postfix Mail Transport Agent Loaded: loaded (/lib/systemd/system/postfix.service; enabled; vendor preset: enabled) Active: active (exited) since Fri 2018-08-24 16:32:16 UTC; 2s ago Process: 6132 ExecStart=/bin/true (code=exited, status=0/SUCCESS) Main PID: 6132 (code=exited, status=0/SUCCESS)