How to limit the overall size of emails

How can the overall size of an email including attachment, encoding etc. be limited to a pre-defined value?


This can be done in the following way :
Go to WHM >> Main >> Service Configuration >> Exim Configuration Editor
In the first box where you can type ( right below where you see ‘#!!# cPanel Exim 4 Config’ ), add the following directive :

message_size_limit = 100M

This will limit the overall size of the message to 100Mb

How to block emails from a specific address using Exim

How to block emails from a specific address on a cPanel/WHM server using Exim ?

This is fairly easy to achieve with Exim.
First you’ll need to find the system filter file for Exim. This can be found out through WHM >> Main >> Service Configuration >> Exim Configuration Editor.
Towards the middle of the page, under the section ‘Filters’ , you ‘ll find the path to the file.
Open that file via SSH using your favorite editor and add the following to it :

    if first_delivery
    and ( (“$h_from:” contains “emailtoblock@domainname.com”)
    )
    then fail
    endif

How to fix the WHM CSF security test errors!

As a part of ensuring security, we perform a CSF security scan from WHM. We may get the following error after the scan

Check csf LF_SCRIPT_ALERT option WARNING This option will notify you when a large amount of email is sent from a particular script on the server, helping track down spam scripts

To fix this error :  ssh into the server and edit the csf configuration file

vi /etc/csf/csf.conf

search for LF_SCRIPT_ALERT = “0″

Change the value from “0″ to “1″ to fix the issue.

Don’t forget to restart the CSF

You may also get the following error :