problem with email sending

[alexo]

Few days ago i notice, that we don't get any email from contact form of our sites. Test php script and really - no email. Try to install other scripts(3 different script), and result is same - no email.

The same picture is on all sites located on this server.

Via Directadmin control panel status of dovecot and exim is up. Try to restart both, and nothing has changed.

Try to check log file

tail -200 /var/log/maillog

output
Jun 26 17:40:13 server dovecot: master: Warning: Killed with signal 15 (by pid=5869 uid=0 code=kill)
Jun 26 17:40:18 server dovecot: master: Dovecot v2.0.9 starting up (core dumps disabled)

Cann't understand where is the problem. How to repair it

Any advice will be appreciated.!
any

 

[nobaloney]

Start by looking at the exim mainlog and other exim logs; find them in /var/log/exim/

Jeff