Exchange 2007 - Sorry MS keeps messing with the site and it is no longer listed so yes it goes in the 2013 bucket.  :)

So I had a nice 24 hour session of attempting to find out why my hubs kept going up and down.  I had to keep restarting the transport services.  Turns out a user attempted to send a 1.5 gb file from one of our Unix systems.  This would all be via SMTP.

We have a 50mb limit set on all connectors and so on.

I would assume the message would simply have been bounced and never caused a problem.  Luckily the network team was able to identify where this persistent connection trying to send this email was coming from.

So the question is why isn't Exchange honoring the limits already

I'm thinking maybe the Tranport Dumpster size is fubar.  It's set to 5 gb.  That's alot!

Changed the size to match 1.5 times our max send.  That should fix it.

Did it fix it?  You'd need to send that same email again to verify.

I'm also curious if this was sent starting as HELO or EHLO.  IIRC the mail client needs to start with EHLO and then it can interpret the size banner.  What's in the log?

It might be hard to attempt to reproduce.  I can ask the Unix guys to attempt but I need a little break.  I had to work all night keeping mail flowing and am kind of tired.  :)

Thank you for the info.  I can attempt tomorrow.