Hello,
* I have taken this post from forums.cpanel.net. This post is originally posted by the GREAT JONATHAN (chirpy)
* if you have a cpanel id please have a look at this thread
http://forums.cpanel.net/showthread.php?t=39520
==========================================================A few important considerations if you haven't already done so:
1. Make sure all the /etc/valiases/domain.com are using :fail: and not :blackhole:
http://www.configserver.com/free/fail.html
2. Where possible, make sure that all the valiases domains have the catchall disabled and set to :fail:
3. Install a dictionary attack ACL:
http://www.configserver.com/free/eximdeny.html
4. Make sure that you have not set split_spool_directory to no (i.e. use the default yes)
5. Make sure you're running exim v4.50:
exim -bV
If it's not:
/scripts/updatenow
/scripts/eximup
6. Make sure that you don't have the queue processing running too frequently, i.e. leave WHM > Tweak Settings > Number of minutes between mail server queue runs > 60
7. Make sure that you have both of the following selected in WHM > Exim Configuration Editor>
Verify the existance of email senders
Discard emails for users who have exceeded their quota
8. In conjuction with sender verification, make sure that you're running bind on your server locally and that it is working and that your servers main IP address appears as the top nameserver in /etc/resolv.conf
9. Limit the length of time that you keep bounce emails in the queue by adding the following into the first texarea of the advanced exim editor:
timeout_frozen_after = 2d
ignore_bounce_errors_after = 12h
All the above can often make a huge difference to the exim load.
===========================================================
I thope it will help you to solve this problem
Let me know the status
With regards,
Bijo