🚀 go-pugleaf

I'm (re)writing some software to handle a mailing list, and I have a
couple of simple questions:

(1) When a message is sent to the list address, it is echoed (after a
bit of processing) to everyone on the list. I would like to keep the
original "To:" and "Cc:" lines (currently I don't) on the echoed message.

I know I can do this by putting the "To:" and "Cc:" lines from the
incoming message into the outgoing message, then handing it over to
sendmail and giving the *real* recipient to sendmail on the command line.

My question: Is this a legitimate thing to do?

A message may get sent to the list address, mom & dad and the family
dog. The echoed message will *look* like it's going to mom & dad and the
family dog, but it is really going to a person on the list. Is there any
chance that some site out there will take the "To:" line literally and
send the message to the family dog?

(2) I don't want to echo bounced mail to the people on the list. So, I
need to be able to distinguish bounced mail from regular mail. Is there
an official way to do this? My current method (which has correctly
recognized all bounced mail for the past year) is to grep the "From:"
line of all incoming messages for one of the following 14 strings:

MAILER-DAEMON@
MAILER-DAEMON>
Mailer-Daemon@
Mailer-Daemon>
MAILER@
MAILER>
uucp@
uucp>
postmaster@
postmaster>
computer_services@
computer_services>
mmdf@
mmdf>

				Thanx,

				Glenn Chappell  <><