WHM How to Change or Limit Email Attachment size

To Limit Maximum Email Size do the following,

Login to cPanel/WHM as root
Under Service Configuration, Click “exim Configuration Manager”
Click “Advanced Editor”
Scroll down and Click “Add additional Configuration Setting”
Find “message_size_limit” in pull-down list and choose
Enter limit that you want to change to
Scroll to bottom and click “save”

Bandwidth monitoring

The easiest way to achieve this in cPanel would be to modify the bandwidth processing time for cPanel's statistics software. This can be configured at WHM >> Home >> Server Configuration >> Statistics Software Configuration >> Schedule Configuration >> Bandwidth Processing Frequency. Note, that this might cause a performance degradation, so keep an eye on the server when these changes are made.

As these websites are likely using the same IP, monitoring individual users with a third-party plugin like Munin will be very difficult. Most user bandwidth monitoring tools will have to parse log files to read the individual bandwidth usage.

Let me know if you have any questions!

To measure bandwidth, cPanel & WHM combines the amount of bytes of an incoming data request with the outgoing transferred data (the response to that request). cPanel & WHM obtains this data from the Apache logs.

These logs include the following amounts of bandwidth:

The total bandwidth that the incoming request that solicited the content used.
The total bandwidth that the complete response used (the sum of the size of the content plus the header).
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https://documentation.cpanel.net/display/68Docs/Apparent+Discrepancies+in+Bandwidth+Usage+Statistics#ApparentDiscrepanciesinBandwidthUsageStatistics-Overalldifferencesinmeasuringbandwidth

Meaning, we look at the data in the "/usr/local/apache/domlogs/DOMAIN" to calculate bandwidth for http and https based on what Apache is reporting.

We then store this information in the /usr/local/apache/domlogs/DOMAIN-bytes_log

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