Gerben,
Note that the HELO string is only ever processed for DMARC if MAIL FROM
is <> and, even then, not all implementations process it at all (it's
dependent upon the behaviour of the underlying SPF implementation).
The tag is telling you that the return path is
Hello,
most probably, the message received by Yahoo is NDR or DSN message
generated by your host. In this case, envelope-from address is empty and
SPF is checked against HELO
mail.mydomain.tld
none
From: probably has something like
From:
I’m setting up DMARC for my mail server. I tried sending a mail to an account
on the icloud.com domain (which reports DMARC) and there I see:
Received-Spf: pass (mr21p00im-spfmilter004.me.com: domain of
myn...@mydomain.tld designates XXX.XXX.XXX.XXX as permitted sender)