SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam since 20140818
md at linux.it
Sat Aug 23 20:10:54 CEST 2014
On Aug 23, Doug Barton <dougb at dougbarton.us> wrote:
> Fortunately SPF is dead simple,
Indeed, since SPF is dead simple it also has bad failure modes which
break many common practices.
This is why DMARC best practices require to use both SPF and DKIM (which
has different failure modes, but at least they can usually be blamed on
bad software used by intermediaries) in the hope that at least one will
> and DKIM isn't that much harder. In fact for
> one domain it's also dead simple (ProTip: Use OpenDKIM). I couldn't find a
The problem is managing it for tens of thousand of domains, when you
often do not manage their DNS zones as well.
The support cost of teaching customers how to implement it is
significant enough that for now blocking IPv6 to gmail is much easier.
(Also, if you manage just a couple of domains on your own personal
server you will probably not have reputation issues with gmail, so this
is barely relevant.)
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