Our client often gets complaint's from their customers not being able to send attachments through to them because they continuously get rejected for being too large.
They're using an on-prem 2010 Exchange server.
The initial message size limit send/receive was set to 30MB.
Their hosted anti-spam solution, Trend micro, has a limit set for 50MB.
I changed the on-prem 2010 Exchange server send/receive to a limit of 50MB for troubleshooting purposes.
We still get bounce backs when sending anything typically over the size limit of 15MB. The message comes back indicating it exceeds the limit of 20MB. After checking all the settings (that I know of), I don't know where the size limit of 20MB is being set. I know that messages grow in size beyond the initial attachment limit, but not to this degree.
Is there anything specifically I've missed in checking?