Dnia 23.11.2020 o godz. 11:49:39 D'Arcy Cain pisze:
> 
> If someone replies to a mailing list and copies the sender then that
> person gets two copies.  The above recipe avoids that.

If someone gets two copies - a direct one and the mailing list one - then
he/she knows that the sender has replied both to author and to the list and
can instruct the sender not to do it. With the above recipe, the recipient
doesn't even know about that.

Moreover, it breaks the continuity of threads on mailing lists, because it's
unpredictable which copy will arrive first, and if only the direct copy is
left, the reply will go only to the sender and not to the mailing list. Thus
some messages are missing from lists.

> People also send to every alias that someone has.  Example,
> billing@, admin@, support@, joe@, etc.

But it's usually one message with multiple recipients, and if all these
recipients "resolve" to the same final destination, the receiving MTA
usually avoids creating duplicates. At least that was always the case for me
as the recipient, no matter if I was using sendmail, Exim or Postfix for my
mail.


Dnia 23.11.2020 o godz. 12:22:37 @lbutlr pisze:
> 
> Everyone who ever used procmail? Nearly everyone who ever used procmail?
> 
> It's even in the procmail man page.

Yes it is, but I never saw any real use case for this.


Dnia 23.11.2020 o godz. 13:24:13 Bob Proulx pisze:
> 
> Although I have been using procmail since the inception of it I have
> always found this type rule problematic.  Because for me it keeps the
> wrong message.  If I am sent a direct copy and a mailing list copy
> then the copy I want is the mailing list copy.
> 
> But so many people use Gmail these days that they have gotten used to
> the way Gmail does things.
[...]

+1 ;)
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."

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