Geoff Mulligan via mailop wrote:
> 1. If a recipient on an email message is both in the To: or Cc: and on the
> mailing list, should the listserver send the message to the recipient:
>      a) By default
>      b) Not by default (but configurable)
>      c) Never

If a message was sent to me directly and also to a mailing list to
which I am subscribed then if I don't get both copies of the message I
look to see what failed that I didn't get the message from the mailing
list to which I was validly subscribed.

The direct copy will show the headers of the message and the body as
sent by the sender directly to me the recipient.  The mailing list
copy will have been process, will have List-*: headers added, will
possibly have footers and subject tags added, will possibly be
converted to a digest (dog help us), and these days will have broken
DKIM by doing so.

Mailman has an option "Filter out duplicate messages to listmembers
(if possible)" that avoids mailing to the subscriber if it sees the
subscriber address in a To or Cc field.  I really hate that feature.

However configurable is best as there are others that like that feature.

> 2. If a mailing list is in the BCC: should a message be delivered to the
> list:
>      a) Yes - always
>      b) No - never
>      c) Configurable
>      d) Convert it to a CC:

Configurable.  Because one size does not fit everyone.  But sometimes
there is only one size available.

I would always say never.  Because what is a recipient going to do?

1) What is this message?  Why am I getting it?  I don't recognize the
author of this message.  Is it spam?  It must be spam!  Report as
spam.  Get the mailing list host on a DNSBL.

2) Most MUAs will look at the To and Cc headers when generating a
direct reply or a group follow-up.  Not having the mailing list in the
visible recipient means that most MUAs will follow-up only to the
visible addresses and no response will ever make it back to the
mailing list.

3) No mention was made of any List-Post header but that is critical to
this discussion.  With a List-Post header an MUA _might_ do the right
thing with a group follow-up response.  Regardless too few MUAs
understand List-Post and too few will do the Right Thing generating a
reply back to the mailing list.

> Thanks - I'm trying to improve my simple mailing list system
> (www.listdist.com)

It's disheartening to me to see a developer of mailing list software
not realize that they are thread-jacking (aka thread stealing) a
previous discussion. :-(

Bob
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