MSG size exceeded

Question

Hello ,
i hope i become an answer to this problem:
we use C600 Machines , and every time a msg size is exceeded
the customer becomes a Notification that your msg size is exceeded.
BUT i cant see any entry in Ironport Log files
ONLY this:
New SMTP ICID xxxxxxxx
ICID xxxxxxxx RELAY SG CUSTOMER match IP .....
ICID xxxxxxxx close
is there any possibility in this case , that i see msg's in Logfiles ?
THX in advance
buzz

Answer 1

I believe both of these happen on the IronPorts, it depends more on the sending MTA than the recieving IronPort.
It all depends on if the sending MTA honors the EHLO SIZE limit feature and does not attempt a message larger than the advertize max. In this case you have a simple ICID xxx close, because the sending MTA did not hit the size limit it simply closes the connection and generated a NDR to the sender saying the message size was beyond what the recieving MTA would accept before it even attempted to send the message.
Second case is when the sending MTA does not use the EHLO SIZE limit feature and sends the message forcing the IronPort to hard reject the message once it hit the max size limit, hence the ICID xxx Receiving Failed: Message size exceeds limit. Same NDR gets generated, but after the wasted bandwidth. :(
Erich