[Mimedefang] 4.7.1 sendmail error

[Greg Schlut]

    I am getting a 4.7.1 sendmail error that is being triggered through 
mimedefang.  Mimedefang also throws a 450 error in the log.  It only 
occurs when I try and send a large zip file(50MB plus).  I have 
increases the number of slaves and increased the timeout as instructed 
from other posts, but that didn't work.  I am running clamAV as well.  
Any suggestions?  We have been breaking the files apart but would like 
to send as one large zip file.

--Greg