<div dir="ltr">pretty sure we require one of dkim/spf/ptr, but not having dkim/spf, we'll just look at it pretty harshly for spam.<div><br></div><div>Brandon</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Dec 16, 2014 at 1:03 AM, Bernhard Schmidt <span dir="ltr"><<a href="mailto:Bernhard.Schmidt@lrz.de" target="_blank">Bernhard.Schmidt@lrz.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Frank,<br>
<span class="">><br>
> Thanks for sharing your experience. You may have been able to send<br>
> email to Google for some days from your IPv6 host without a PTR, but<br>
> I think that would only go on for a short time. Have you tried<br>
> sending to Comcast?<br>
<br>
</span>Note that I specifically do not suggest sending without PTR. We reject<br>
on missing FCrDNS even in IPv4 and are pretty happy with that (with an<br>
easy process to whitelist though). But I tried it to O365 and the mail<br>
went through nevertheless.<br>
<br>
According to<br>
<a href="https://www.m3aawg.org/sites/maawg/files/news/M3AAWG_Inbound_IPv6_Policy_Issues-2014-09.pdf" target="_blank">https://www.m3aawg.org/sites/maawg/files/news/M3AAWG_Inbound_IPv6_Policy_Issues-2014-09.pdf</a><br>
which Google, Microsoft and LinkedIn claim to follow you need a "PTR and<br>
(SPF or DKIM)". And we've been preferring IPv6 outbound for 5+ years<br>
now, without any issues. 99% of our mail does neither have DKIM nor SPF.<br>
<span class=""><br>
> From an ISP perspective, adding in an SPF (or equivalent TXT) record<br>
> for the IPv6 space of your ISP mail server would not be a hard thing<br>
> to do. While not all email servers support DKIM, all DNS servers<br>
> support TXT records.<br>
<br>
</span>Both SPF and DKIM are controlled by the sender domain, not by the<br>
operator of the sending mailserver. Think the classic Permit-by-IP<br>
smarthost run by ISPs, you just cannot make any assumptions there about<br>
the sender.<br>
<span class="HOEnZb"><font color="#888888"><br>
Bernhard<br>
<br>
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<br></blockquote></div><br></div>