I have a fresh
exim4 install without any tweaks on a
Debian 8.6 machine.
I use it to send emails from PHP:
; /etc/php5/fpm/conf.d/mail.ini [mail function] sendmail_path = /usr/sbin/exim4 -t mail.add_x_header = On mail.log = syslog
Recently we began to receive a lot of spam emails, which exim tries to send back, because of inexistent recepients.
So, I ran exim statistics tool and got:
# /usr/sbin/eximstats -ne -byhost -bydomain -byemail /var/log/exim4/mainlog Top 50 local senders by message count ------------------------------------- Messages Bytes Average Local sender 603 1395KB 2368 Debian-exim 38 127KB 3422 website1user 33 94KB 2916 website2user 7 91KB 13KB website3user
Normal sites send tens of emails per day, and
Debian-exim user sends hundreds of ones to some random addresses, which I even don’t know.
How can I completely deny some specified users to send emails through
Should I deny
Debian-exim user? What is it used for?
Notice that I mean not sender email addresses to deny (they can be replaced with no effort in headers of the email) but local users here.
(Maybe I have completely lost an understanding of situation?)