On 14.01.23 11:02, Chris Green wrote:
I use postfix on my home server and deliver mail by connecting to my
hosting providers' "smart host" using authenticated SMTP.
My home system's hostname is zbmc.eu but I don't use that domain in my
E-Mail address, I use isbd.co.uk which domain is hosted at one of my
hosting providers (mythic-beasts.com).
However most of the time I use my hosting at gandi.net to send my
E-Mail, so mail from ch...@isbd.co.uk originates on zbmc.eu, is
transferred by authenticated SMTP to mail.gandi.net and is sent on
from there to whatever its destination is.
As I understand it the SPF records for mail.gandi.net purely confirm
to a receiving mail server that the mail is coming from mail.gandi.net
and reverse DNS look-up confirms that it really is mail.gandi.net.
Have I got that right?
SPF records for mail.gandi.net are checked when someone sends mail from
@mail.gandi.net (you don't) or when server introduces itself as
mail.gandi.net (I assume yours introduces as zbmc.eu).
so, you should not care about SPF record for mail.gandi.net but for SPF
record for isbd.co.uk
I.e. the fact that the mail's From: is not
connected in any way to the SPF record is irrelevant. The SPF record
simply confirms the SMTP relay host's IP and that it is meant to be
relaying mail for that IP.
Header From: is irelevant with SPF.
Envelope from: is relevant and "isbd.co.uk" should have SPF record
including mail.gandi.net or whatever mail.gandi.net admins tell you to
include in SPF.
--
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.
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