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Hello,

I had the below message from a customer, could this be something to do with any server changes. I know this is because of the failure rate however the below gmail account he says does exsit.

Kind regards,
sachin


-----Original Message-----
From: lin@xxxx.co.uk [mailto:lin@xxxxx.co.uk]
Sent: 04 April 2016 13:30
To: john@xxxxx.co.uk
Subject: email

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

xxxxxxxx@gmail.com
Domain xxxxx.co.uk has exceeded the max defers and failures per hour
(5/5 (26%)) allowed. Message discarded.
Reporting-MTA: dns; mail.xxxxxx.com

Action: failed
Final-Recipient: rfc822;xxxxx@gmail.com
Status: 5.0.0

it seems the mentioned error was initiated because of the below WHM settings in WHM > Exim Configuration Manager

Ratelimit incoming connnections with only failed recipients [?]
Ratelimit incoming SMTP connections that have only sent to failed recipients five seperate connnection times in the last hour.

What I suggest is look for any file named /var/cpanel/email_send_limits/max_deferfail_xxxxx.co.uk and if found remove that file from the server after take a backup.