🚀 go-pugleaf

> Doesn't Return-Receipt-To: cause a mail loop with sendmail?  I seem to
> recall having that problem the one time I tried using this feature.

No mail loop is caused, but there appears to be a sendmail bug
which causes a return receipt to be returned to you whether or not
the sendmail is doing final delivery of the message.  In other words,
you may get a receipt from each sendmail that your message passes
through on its way.  I've reported this bug to Sun but I don't know
if they have a fix.

Also, you have to very carefully craft the address to which you
request the receipts to be sent.  On networks like uucp, you have to
figure out a "return address" that will work from the recipient site(s).
I think this could be a problem on the Internet too, since some hosts
use one naming scheme and some hosts use another.
-- 
John Gilmore  {sun,ptsfa,lll-crg,ihnp4}!hoptoad!gnu   jgilmore@lll-crg.arpa
		     May the Source be with you!