On Thu, 26 Sep 2019 12:36:41 -0400, Ken Hornstein said:
I received this email, and I wanted to pass it along. The executive summary is: in the near future subject lines to nmh-workers will no longer be prefixed with "[nmh-workers]" and there won't be a footer at the end of the message anyone saying that this is the nmh-workers
OK by me., my procmailrc already uses '*^(To:|cc:).*nmh-workers@nongnu.org' so it won't bother my set-up.
mailing list. You can read the details in the message for the complete technical reasons why this is happening; the other option is to do what is called "Munge From" and I personally think this is 100x worse
Amen to that. Listserv also adopted a Munge-from solution, and the users rioted. In particular, the users whose From: got munged were incensed, because it makes 'reply from' very ugly and sometimes non-functional. (For the backstory of why this matters - if a Yahoo user (as opposed to a random non-Yahoo-using yahoo) sends a mail to a list, and the list modifies the Subject: line, then when it gets to the final recipient, their MTA looks at it, sees that Yahoo specifies very strict DMARC, which got borked by the change of the Subject: line. If the recipient MTA does DMARC checking on receipt, it potentially generates either a 5xx error inline or a bounce message that eventually get back to Mailman/Listserv/ whatever list management software. The end result is that if enough Yahoo users post to a list in a short time period, then you have a flurry of *NON*-Yahoo users being mysteriously unsubscribed from the list for no really immediately obvious reason.
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