[Mimedefang] Mbox Format From Separator Origin

[Kevin A. McGrail]

Hi All,

Mbox files are stored with a separator of From  aka the From_ line.  When 
you use MD and quarantine the entire message, the From line is missing.  I 
can generate a From header that tricks mail programs into thinking it's a 
valid Mbox format file, thanks to DFS.

However, what's the origin of the From separator to begin with?  My belief 
is that it is the local delivery system, for example procmail, that 
generates it.

How can I generate one from MD or, more towards my goal.  The leading 
question in this is that some emails seem to get a From line that is 
generated with local user information, and others get it with more 
email-specific sender information.  I'm trying to figure out if the lack of 
email-specific From information would indicate spam.  However, a quick 
peruse of my own corpora and quarantined email doesn't help much.

Anyone have any hints?

Regards,
KAM