On Mon, Mar 23, 2020 at 10:42:29AM +1300, Peter wrote:
> > That could be a hack like this (in Postfix or Majordomo):
> > - In Postfix, trigger on listmanager envelope address info
> > - Munge From: (combining original From: and listmanager envelope address
> > info).
> > - Munge Reply-To: (using info from original From:).
>
> Isn't it better to have Reply-To: go to the list?
It is best to not modify the message headers at all, which is
effectively what the Postfix list does (it adds a Sender:
header which should not be covered by the upstream DKIM
signature).
> > - Strip DKIM, as the info would be invalid anyway.
>
> I would add in DKIM and/or ARC signing. I honestly don't know if we can
> do both, but if so then we probably should. There may be servers that
> verify DKIM but don't know about ARC.
ARC signing might be helpful, but I don't think we need to do anything
at all. With just one user having issues, the problem is most likely
upstream.
To participate in this list, feel free to DKIM sign your mail, but best
to stay clear of DMARC, just case your DKIM signatures become invalid
in transit.
--
Viktor.
