On 22.11.19 06:15, Richard Damon wrote:
Normal forwarding will break SPF,
note that by "normal forwarding" Richard meant the old-school "re-send mail to new recipient, keep its contents and the envelope sender" where the keeping envelope sender is what breaks SPF. This is imho valid, because at forwarding time, it's already not the original envelope sender who sends the mail - in fact it's the original recipient who forwards it. So, if an error occurs after forwardins, it's not the original sender who should get notification, but the recipient who has forwarded it. The SRS method was designed to avoid this problem, add the original sender to the envelope address, so forwarding MTA (or whoever) This mailing list does not break SPF, because it re-sends mail using envelope sender "owner-postfix-us...@postfix.org".
The issue is that many mailing list will break DKIM by slightly modifing the message, like adding a signal word to the subject or a footer with information like unsubscribing instructions (this can be a legal requirement in some jurisdictions). Note, this list does NOT do this sort of modification, so doesn't cause that sort of problem.
...and even adding this information to list mail doesn't prevent some subscribed users from complaining about getting the mail. Unfortunately, MUA support of maling lists is not very common. -- Matus UHLAR - fantomas, uh...@fantomas.sk ; http://www.fantomas.sk/ Warning: I wish NOT to receive e-mail advertising to this address. Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu. M$ Win's are shit, do not use it !
