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

Marco d'Itri md at
Sat Aug 23 23:20:46 CEST 2014

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

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