Custom Reply-To header with multiple addresses?

[Lloyd Zusman]

I couldn't find anything about this in any documentation, nor by
trying to dig through the source code.

I have a special case that I'd like to try to achieve in IMP.  For one
of my email accounts, I'd like to insert a special `Reply-To' header
as follows in all outgoing email:

  Reply-To: addr1@host1.com,addr2@host2.com,addr3@host3.com

Is there any way I can cause IMP to automatically do that for me
for all outgoing mail for a specific user ID?

Thanks in advance.

-- 
 Lloyd Zusman
 ljz@asfast.com