Return address for autoresponder

[Leander Berwers]

Hello


I am writing an auto-responder in Perl. I have been looking for the ones
publicly available, but I was wondering to what address I have to
respond to, namely:

Do you need to look for Reply-To: first and if that header is
unavailable look for From:? Or has qmail a mechanism for itself to
determine it (I think their is nothing useful in $ENV[].


Regards
Leander