The comments in the code just mean that in general the "Reply-To:" should
point to the list for a digest (as opposed to the -search-request
address, a couple lines above, or the LISTSERV address). The lack of
support for the "Reply-to=" keyword was an oversight, which I have fixed
for 1.8b. For now the only way to get the behaviour you need is to set
the "Sender=" keyword to the value you want.
Eric