1) User A sends mail to the list. User B responds to User A's
message, and User B's mail handler puts both User A's address and
faq-maintainers@mit.edu in the header of the response. User As a
result, User A gets two copies of the response -- one sent directly by
User B's mailer and one sent via faq-maintainers@mit.edu.
2) A message is actually sent to the list twice.
The vast majority of doubled message people have been observing have
been due to cause (1) -- of the last 85 messages to the list, 35 of
them have done this. People should be careful when responding to a
message to faq-maintainers to remove everyone except the list itself
from the recipient list of the response, unless there are people on
the recipient list who might not be on faq-maintainers (this is
unlikely during an ongoing discussion on the list).
It appears that one duplicate message was sent to the list earlier
today (Nathan Torkington's message entitled "New version of the FAQ
FAQ"). It was delivered twice, about four minutes apart, by
kauri.vuw.ac.nz to MIT.EDU. The repeated delivery was probably due to
some sort of rare transient error that isn't likely to occur very
often.
In short, I don't think there's much to be done about this problem.
Jonathan Kamens | OpenVision Technologies, Inc. | jik@security.ov.com
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