Robert Dockins wrote:
I think (pure speculation) the haskell.org mail server is set up to omit people from mail it sends if they appear in the To: or Cc: of the original mail.
Yes, this is a feature of recent Mailmans.
Finally, I agree that reply-to munging is a bad idea, but I don't think appealing to a definition of 'reasonable mailer' that doesn't match a large portion of mail clients currently in the wild is a good way to argue the point.
Gnus might have been the first one to have it, but mutt (very popular in hackerdom) was perhaps the one that popularized it. I am currently using Mozilla Thunderbird, for which it is available as an extension (unfortunately, it also requires a patch for Thunderbird; but Debian sid has already applied it). Still, when choosing between a poor hack (Reply-To munging) and the right answer (fixing mailers to support reply-to-list), I know which I prefer. The former may be appropriate in mailing lists where the audience consists solely of non-geeks (who might not be able to choose a good mailer), but in technical lists, I see no need for it. If you prefer a mail client that does not support the feature, bug your vendor to add it.