Iam getting email failure messages from a domain hosted in our server, The content like “Domain domain.com has exceeded the max defers and failures per hour (5/5 (100%)) allowed” .
Chances are your client has triggered a fail safe in Exim that restricts them from sending any email out of your server. This event is triggered when an account sends email to addresses that fail or defer more than the set limit. If we limit set within the WHM is 50% or lower mail will now be rejected when that account sends more email andif any 5 email failures.
Here’s how you can change the threshold or disable this feature!
Log into the WHM as root
Click tweak settings
Click the Mail tab
Scroll down and find the “Maximum percentage of failed or deferred messages a domain may send per hour” setting
Change the % or you can disable this feature by selecting the Unlimited option
Maximum percentage of failed or deferred messages a domain may send per hour