Email from standardbank.co.za might fail with bodyhash_mismatch.
Since it’s a bank most people panic and think it’s their own email systems that are at fault.
Actually, it takes two to tango and big companies also have problems.
In order to settle the customer services your cPanel side, you can do this:
WHM >> Exim Configuration Manager, try turning the following option off: Allow DKIM verification for incoming messages
Updating “Allow DKIM verification for incoming messages” from “On” to “Off”.
“Allow DKIM verification for incoming messages” was updated.
This is anyway a non default. You’ll probably have more spam but less problems.
Below is an an example received from MS Office 365:
Example:
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The message is pretty ominous. It means it was modified in transit. Good luck escalating to Standard Bank.