We are getting this bounce error message from our customers trying to send emails to our newly built C370 Ironport box.
Here is the error message;
"The following message to firstname.lastname@example.org was undeliverable.
The reason for the problem:
5.3.0 - Other mail system problem 552 - '#5.3.4 message header size exceeds limit'"
Hope is Delivery Satus Notification will help to identify what the problem is about.
Appreciate your kind response on how to fix this issue.
Go to Solution.
Please check our following knowledge base article which explains this error and provide solution for it.
Message Bounces with "552 #5.3.4 message header size exceeds limit"
Hope this helps!
Customer Support Engineer
View solution in original post
That was a great response.100% correct.
I am not able to access above link. Please help me to access the correct link.
I my case I forgot to configure the SMTP route in ESA to point to the Exchange server behind the ESA.
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