HowTo :: allow delivery of an attachement with a banned extension such as .eml or .exe?
Assuming you are running cPanel/WHM v11.xx, login to the WHM >> Exim Configuration Editor and you'll find a selection for filtering...

HowTo :: manage Exim Mail Server
Description Command Who is having large number of emails? /usr/sbin/exim -bp | exiqsumm To check a message header /usr/sbin/exim -Mvh...

SpamAssassin is causing high CPU load
It is likely that there are clients set their default address to either :blackhole: or to their own USERNAME. You need to change the default address...

error: Can't locate Mail/SpamAssassin/CompiledRegexps/body_0.pm
If you get this error message: Can't locate Mail/SpamAssassin/CompiledRegexps/body_0.pm SSH to the server and run the following commands: ...

Horde error: Could not connect to database for SQL SessionHandler
When I login into webmail and try to connect through Horde I get the following error: A fatal error has occurred Could not connect to database for...

Starting spamd: Can’t locate Cpanel/SpamAssassinSandBox.pm
If you get the following error message: Starting spamd: Can’t locate Cpanel/SpamAssassinSandBox.pm in @INC (@INC contains:...

HowTo :: stop Exim from sending messages with certain extensions
SSH to the server and edit the following file, using your favorite Linux text editor such as pico or vi. Remove or add the extension of your...

Receiving multiple/duplicate copies of the same email message at different times
A few of my clients reported receiving multiple/duplicate copies of the same email message at different times. --- For example --- They...

lowest numbered MX record points to local host
Q: I see this error message in Exim main log file: 2008-02-14 00:30:00 lowest numbered MX record points to local host: DOMAIN.TLD (while...

Warning: SPF cannot be used because this server is not a DNS server for ...
The message means cPanel included the SPF record in the Zone file on the local server, but since that server is not authoritative for the domain,...

HowTo :: stop in-house spammer
In the event of a client script being used to send out spam, how can I stop him/her with cPanel v11.x? SuPhp works with all versions of Apache...

HowTo :: change all the default addresses on one server to :fail:
cPanel powered servers If you've used :blackhole: in the past for all your domains, you can quickly substitute :fail: instead using ...

Authentication failed :: 535 Incorrect authentication data
One of my client can't send/receive email. The log file shows the following error message: Message not sent. Server replied: Authentication...

BoxTrapper: Pros and Cons
What is BoxTrapper? BoxTrapper is a neat application that traps every single incoming message in a queue and requires an extra verification step...

Is there an AntiVirus I could install through the cPanel/WHM?
You can install ClamAV via the cPanel/WHM. To do this, login to WHM and in the cPanel section click on "Plugins" (Add-Ons in version 10) and...