My Exchange 2016 server is rejecting an incoming SMTp message with error:
Remote Server returned '550 5.2.3 RESOLVER.RST.SendSizeLimit.Org; message too large for this organization'
I confirmed that the site, Exchange receive connector, and recipient mailbox have 25MB size limits. However, this message is only 8MB size (+MIME overhead so x1.37).
Can someone explain where else I can check to resolve this?