حل مشكلة 451-The server has reached its limit for processing requests from your host
451-The server has reached its limit for processing requests from your host.n451 Please try again later.
The proper method to revise this value would be in WHM > Exim Configuration Editor > Advanced Editor area. In the topmost box, if you input the value and click the "Save" button:

Then you should find something like,
كود:
smtp_accept_max = 100
Change it to higher value like 200 and save it.



المرجع:

http://www.mickgenie.com/cpanel-exim...rom-your-host/
https://forums.cpanel.net/threads/th...st-n451.98605/