Client wants to receive large attachments because customers are trying to send huge things that they shouldn't, and it's easier to receive them than try to train the sender in good internet practices.
I compromised and said I'll allow up to 40MB attachments be received. This has been working for a long time.
Last week (sometime) it started rejecting everything over 10MB.
Everywhere I look, I see that 40MB was setup properly.
[PS] C:\Windows\system32>get-transportconfig | fl maxreceivesize, maxsendsize
MaxReceiveSize : 40 MB (41,943,040 bytes)
MaxSendSize : 40 MB (41,943,040 bytes)
and for the user in question:
[PS] C:\Windows\system32>get-mailbox john | fl maxReceiveSize,MaxSendSize
MaxReceiveSize : 100 MB (104,857,600 bytes)
MaxSendSize : 100 MB (104,857,600 bytes)
Even the best practices analyzer recognizes that it should be 40MB (and complains... as it should):
Yet, I am still getting bounces for things that are only 15MB:
Delivery to the following recipient failed permanently:
Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain theclient.com by office.theclient.com. [123.456.78.9].
The error that the other server returned was:
552 5.3.4 Message size exceeds fixed maximum message size
Where else should I be looking?