On Mon, Jul 06, 2020 at 07:40:27PM +0000, Drew Tomlinson wrote:
I use postfix for my own domain and have been forwarding my email to
outlook.com for years. Recently, email has just been disappearing
between my server and my inbox so I set it to forward my email to
gmail.com. Shortly after, I saw some messages like these in the logs:
You're running into intentional breakage caused by SPF and DMARC.
Sadly, this means that (simple) mail forwarding no longer works
reliably.
In reading Google documentation, I learned SPF is failing. Further
reading revealed this is a common problem with forwarded email since
it is not being sent by an authorized IP address. Other articles
suggested the workaround for this is to change the "Mail From:" to
reflect my domain since I have SPF configured for it. And maybe this
is what is meant by SRS (Sender Rewriting Scheme)?
On 06.07.20 15:53, Viktor Dukhovni wrote:
Even changing the envelope sender is not enough. With DMARC you
need to also change the "From:" header in the message.
only if content changes, OR a DMARC mail passes SPF but not DKIM,
(iirc)
This should make it a bit easier to be DMARC compliand by implementing SRS
(forwarding that keeps SPF working).
Domains that configure DMARC but not DKIM (are there such?) are of course in
trouble when their mail is forwarded this way.
The simplest thing to do is to encapsulate the original message
as attachment to a new message.
yes, this should work too.
--
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.
He who laughs last thinks slowest.
