SysAdminGear

I found a good link where you can test a SMTP server the online simple program will check for any configuration trouble and display it. You just need to enter the server address to start the tests. It is util to check if spammers can use your server to spam.

SMTP test

These are some useful Exim commands

--------> REMOVE MAILS BY ID -------->
# /usr/sbin/exim -v -Mrm (MAIL ID HERE)

--------> LIST QUEDED MAILS -------->
# /usr/sbin/exim -bp

--------> OUTPUT NUMBER OF QUEDED MAILS -------->
# /usr/sbin/exim -bpc

--------> DELETE FROZEN MAILS -------->
# /usr/sbin/exim -bp | awk '$6~"frozen" { print $3 }' | xargs exim -Mrm

--------> DELIVER FORCEFULLY EMAILS -------->
# /usr/sbin/exim -qff -v -C /etc/exim.conf &

--------> FREEZE MAILS FROM SENDER -------->
# /usr/sbin/exiqgrep -i -f (MAIL ADDRESS HERE) | xargs exim -Mf

--------> REMOVE MAILS FROM SENDER -------->
# /usr/sbin/exiqgrep -i -f (MAIL ADDRESS HERE) | xargs exim -Mrm

If you get "User 0 set for local_delivery transport is on the never_users list" error on exim_paniclog, you can try to fix it.

How to Fix:
# ln -s libdb2.so.3 libdb.so.3
# /scripts/eximup --force
# /etc/rc.d/init.d/exim restart

Read More:
http://forums.cpanel.net/showthread.php?p=135790