I got the following message when trying to send outgoing mail from a supposedly no limit applied GW8 system.

Response: 552 5.3.4 Message size exceeds fixed limit

I had 2 attachments totalling over 25MB and the mail did not get to the destination. I'm also told that the same is true for any inbound messages with 5MB or larger attachments.
I've checked every item in the GWIA and cannot see any limit size applied and to my knowledge that should indicate that there are no limits on incoming and outgoing messages and attachments. Can someone shine some light on this for me.