On 14/02/22 15:27, John Levine wrote:
It appears that joea- lists <joea-li...@j4computers.com> said:
So, back to my pondering. If I were, via some means, to add "Reply-To:
The-right-list" this should solve the problem described above.
However my "email foo (as distinct from "email fu" stops well short of knowing
what this might break upon replying with this doctored header.
That is, will it cause "breakage" of certain SPAM/Malware checks, or email
tamper detectors.
List software does that all the time. It won't cause any problems that you
don't already have from
the routine changes that lists do.
Modifying headers has the potential to break DKIM signatures. But as
long as you have done your own DKIM checks (if any) prior to adding the
header, and you aren't forwarding the modified emails to external
addresses then you should be fine.
To put it another way: If you are forwarding emails to another domain
(e.g. with .forward files), and the original email had a DKIM signature
incorporating the Reply-To header, which has been invalidated as a
result of your adding/changing the Reply-To header, then the forwarded
email may be blocked (e.g. by DMARC), or could result in a higher SPAM
score, which could cause the email to be treated differently?
Nick.
