WHM/cPanel / disable POP before SMTP

Navigate to the Tweak Settings interface, which is under Server Configuration in the WHM sidebar menu. Search for Pop-before-SMTP and activate the tweak.



For security reasons, cPanel highly recommends that you disable this functionality.

:

https://blog.cpanel.com/setting-up-a...mtp-in-cpanel/
https://serverfault.com/questions/72...op-before-smtp