> > SMTP from an address with no reverse DNS is a fairly good indicator
> > of a spam source. YMMV.
> 
> Agreed.

As a matter of fact, I *do* have working PTR, SPF, and all that stuff,
for both IPv4 and IPv6, and it doesn't help. I should note that I did
have that all the time, not just after Google decided to blacklist me. I
have tested my setup against some very restrictive mail servers, to make
sure it is sane, and a friend and I have worked together closely to
create waterproof and well-functioning mail systems. I am PMed in
various chat rooms when Postfix questions come up. The reason for Google
rejecting IPv6 mail is *not* only broken client setups. Period.

Google started rejecting IPv6 mail from my n...@naturalnet.de address to
their servers, even legitimate mail to us...@jitsi.org (why an open
source project uses Google services and *then* relay mail to their own
mail server is a mystery to me), which is an address tuple that by all
means should be known to Google as being legitimate.

Jesus, I have worked around a lot of misconfigurations by other
providers to allow me and my users to send mail there, the most
prominent one being United Internet's failure to accept 8bit MIME
messages (they were advertising 8bitmime in EHLLO, then when being hit
by a real 8bit MIME message, they accepted it and cast it away in an
awful attempt to prevent backscatter because some of their internal
systems could not handle 8bit MIME). I am just tired of big companies
that sell their services not being up to the task while virtually every
little person out here in the community is.

Paying Google customers, please help us get our mails through!

Google users in general, please move away there!

-nik

-- 
* mirabilos is handling my post-1990 smartphone *
<mirabilos> Aaah, it vibrates! Wherefore art thou, demonic device??

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