Email Attachment Size Limit

Is there any known size limitation sending file attachments using Mstm.SendMail?  Is this configurable?  (Or might that be limited by our SMTP server itself?  We plan to chase our SMTP administrators down, but trying to chase down all possible avenues to shorten the wait time as the requirement is time constrained.)

We can successfully send some email attachments, but not others.  Our initial guess is due to size.  The one erroring is 8M in size whereas the ones getting through are much smaller.  8M doesn't seem terribly large (in today's standards).

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