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

Brian E Carpenter brian.e.carpenter at
Sat Aug 23 23:32:59 CEST 2014

On 24/08/2014 09:20, Marco d'Itri wrote:
> On Aug 23, Brian E Carpenter <brian.e.carpenter at> wrote:
>> Actually I think you should quibble. The issue isn't "bad" software
>> used by intermediaries, it's that by design DMARC p=reject breaks a
>> very common model used by intermediaries. Whether that is a bug or a
>> feature in DMARC is out of scope for this thread, however.
> I was not referring to the mailing lists issue, which is not relevant 
> unless you also use DMARC with p=reject, but to broken MTAs which mangle 
> forwarded messages (look for DKIM validation failures and you will 
> easily find many).

Oh, OK, that wasn't obvious from the context.


> There is a reason if DMARC was designed to use both SPF and DKIM.

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