EMail attachment size, what is your limit???

MIME encoding sucks :lol:
A email with a 35meg .zip attachment comes in as 49.6megs (using the smtp logs)
I've got a non-tech CTO that want to accept 50meg attachments. It seems to be working but sometimes the SOPHOS AV engine crapsout and the email ends up in the quarantine.
For business to business email what is a reasonable size limit?

MIME encoding doesn't suck! What sucks is the fact that we still need to do it. The fact that SMTP is still a 7-bit channel is annoying.
I don't administer an Exchange server myself, but our Exchange admins explained to me that Exchange does size limiting based on the native (aka decoded) size of the attachments. The FreeBSD/qmail server I run enforces the maximum message size based on the wire size, i.e. base64-encoded for anything binary. Since base64 is a 6-in-8 encoding, that increases the object size by 33%. In order to reconcile the size limits on these two systems, the Exchange limit is set to 30 MB and the qmail limit is set to 40 MB. That's usually enough for the PHBs to mail around their humongous PowerPoint presentations.
I haven't bothered messing with the message size limits on our IronPorts, since our back end servers enforce their own limits.

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