Exchange 2013 cu10
we own another domain for which we've configured an MX record for it to point to our perimeter gateway server which in turn points to my CAS. the domain is configured as an accepted domain also.
i have added to my existing mailbox a new email address supporting this new accepted domain.
whenever i send a test email from either yahoo or gmail, i receive this error message:
The reason for the problem:
5.3.0 - Other mail system problem 552-'#5.3.4 message header size exceeds limit'
sending to my regular email address, same mailbox, works just fine. only when i send to this new additional email address do i get the error message.
i have asked our admin for the perimeter gateways to check from his side too. i have also doubled, from 128KB, my Exchange's header size limit to 256KB for all receive connectors and i still get the same error message.
where else could the error be coming from?