> I'd like to know what the latest word is on handling return-receipt headers
> in messages from subscribers to the list...
Delete them. (If you really want to, issue a response to the sender
from the list expander, but don't leave them in the messages you
send to the list. Especially if the list is gatewayed to a newsgroup!)
The IETF NOTARY working group is developing a standard for both delivery
reports and an SMTP extension to request delivery reports. This avoids
the problems inherent in the return-receipt-to header.