My client's Exchange 2010 has been set to send/receive messages up to 25MB, however Exchange still rejects messages 16-20MB in size:
Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 552 552 5.3.4 Message size exceeds fixed maximum message size (state 17).
They don't want a 25MB limit, only 20MB. But the limit doesn't seem to have an effect - messages still get rejected due to size.
Send & Receive connectors are all set to 25MB limit.
Anyone have any ideas on this?