SMTP over IPv6 : gmail classifying nearly all IPv6 mail as spam since 20140818

Doug Barton dougb at
Sat Aug 23 20:53:27 CEST 2014

On 8/23/14 11:45 AM, Marco d'Itri wrote:
> On Aug 23, Doug Barton <dougb at> wrote:
>> Yes, I get it. Advances in e-mail security are making your life (and perhaps
>> even your business model) more difficult, and you don't like that. But
>> complaining about it isn't going to help. The world is moving on, if you

> Yes, this is clear to me even without the lecture: in the email world
> receivers make the rules, so right or wrong they may be the rest of the
> world has to adapt.

Excellent, I'm glad we found some common ground. :)

> I was just pointing out that some "facts" are not so well established.

If you'll pardon me saying so, it seems that you have a pretty 
well-defined agenda through which you're viewing your "facts." But 
again, I won't quibble.

>> DKIM, etc. It's been a couple of years at least that you can't send mail
>> with any degree of confidence to the big three without at least SPF, and
>> over a year that you also need DKIM.

> Looks like your servers are in a very bad neighborood then

Actually it's squeaky clean, and my IHP has no tolerance for 
shenanigans. I chose them partly on that basis.

> (or you have
> a very problematic mail stream), because I am quite sure that this is in
> no way universally true.

I didn't say "universally true." I chose my words in my previous message 
carefully, and I stand by them.

However what IS universally true is that the holy triumvirate of 
rDNS/SPF/DKIM will only make it more likely that your mail will be 
accepted, and is the only way to avoid outright delivery failures and/or 
arriving in the spam folder for many receivers, and the value of "many" 
increases daily.

Given that we seem to be in agreement on that, hopefully we can now all 
move on. :)


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