On Mon, Dec 5, 2016, at 16:20, Steve Atkins via dmarc-discuss wrote:
> 
> > On Dec 5, 2016, at 1:32 PM, Denis Salicetti via dmarc-discuss 
> > <[email protected]> wrote:
> > 
> > Hi Guys,
> > I am having a strange behaviour with Google Calendar.
> > 
> > Since I decided to set p=reject to my domain (galeati.it), every time I 
> > share a calendar with another user, Google notification (attached) gets 
> > rebounded immediately. I think this should not happen because my SPF record 
> > include: _spf.google.com ~all
> > 
> > Any suggestions?
> 
> Mail from within Google to other places within Google may not cross the
> external, non-ten-dot internet at all - and so cannot comply with your
> SPF requirement. From your forwarded error that looks like it may be
> what's happening.
> 
> Should that cause a DMARC failure? Probably, yes. This may not be a good
> domain to publish a DMARC p=reject message for.
> 
> The only people who can fix it (other than you by removing your DMARC
> records) are probably Google support, given they're your vendor for both
> the sender and the recipient.

Oh shoot, I missed the TXT file. Okay, looking at the headers: 

From: [email protected]
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=galeati.it; s=google;

That looks like message did get DKIM signed and is aligned to the From
header, so shouldn't that be enough to pass DMARC in this case, even if
SPF fails?

I agree that this should be fixed within Google, but if I were Google, I
might also include all of my internal IPs in my internal representation
of "_spf.google.com". Also something only Google could address, of
course :)

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