vi /etc/default/exim4 vi update-exim4.conf.conf update-exim4.conf vi exim4.conf.template systemctl restart exim4.service netstat -tulpn|grep 25 most /var/log/exim4/rejectlog most /var/log/exim4/paniclog most /var/log/exim4/mainlog most /var/log/mail.err most /var/log/mail.log