{BCC'ed to three Core groups}
Following the recommendation of the mailman developers,
I have activated occasional "VERP"ing for our mailing lists.
(and will turn it off again, after about a day or so).
Here is the mailman "comment-docu" on this :
# These variables control the format and frequency of VERP-like delivery for
# better bounce detection. VERP is Variable Envelope Return Path, defined
# here:
#
# http://cr.yp.to/proto/verp.txt
#
# This involves encoding the address of the recipient as we (Mailman) know it
# into the envelope sender address (i.e. the SMTP `MAIL FROM:' address).
# Thus, no matter what kind of forwarding the recipient has in place, should
# it eventually bounce, we will receive an unambiguous notice of the bouncing
# address.
#
This is in order to better track down those invalid e-mail addresses
with mail servers that do not send back bounces which mailman
(the mailing list software) understands.
Otherwise I would have to manually find out what went wrong and
disable / unsubscribe unused addresses. This is no longer an
option, e.g., for R-help with more than 2000 addresses
subscribed and more than a dozen subscriptions changes every day.
Consequence:
The mails are sometimes (every 10th time) sent out
individualized with a "Sender: " header that now looks like
this (for me):
>> Sender: r-devel-bounces+maechler=stat.math.ethz.ch@stat.math.ethz.ch
instead of
>> Sender: r-devel-bounces@stat.math.ethz.ch
This is both *slower* and may require that you change your mail
pre-sorting if it currently relied on "Sender:".
E.g., I'd use procmail rule for the R lists such as
:0:
* ^Sender: (r-|bioco)[-a-z]*-(admin|bounces(\+.*)?))@stat\.math\.ethz\.ch
R-lists.spool
where the "(\+.*)?" allows for the occasional VERPing.
I hope these consequences are small enough,
and will help to rationalize the keeping of a clean mailing list
address base.
Martin Maechler <maechler@stat.math.ethz.ch>
http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
