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How to avoid being classified as spam by Google?

Folks,

I hope this is not too off-topic, but I figure this is the best
mailing list because we're probably not in this boat alone, wherein
we're annoyed (very) and a bit helpless about Google. I have to ask
here, because Google of course doesn't care about us.

We operate several postfix mailservers with hundreds of users, and
the rate at which these users find their emails spamfiled on the
side of Gmail recipients is increasing.

And yet, we're doing everything we can! SPF is configured, DMARC is
configured, DKIM works. And we've even registered the domains and
MXs with Google's Postmaster services,
<a href="https://postmaster.google.com/" title="https://postmaster.google.com/">https://postmaster.google.com/</a>.

And yet, most mails are filed as spam on their side. And we just
cannot figure out why. I promise we're not writing about
enlargements or crypto scams. We use proper English (or German), and
we know how to capitalise words.

Looking at messages being classified, there is nothing in the
headers that gives any clues. In fact, the headers look just fine:

Authentication-Results: mx.google.com; dkim=pass (test mode)
header.i=@example.org header.s=2015-11-14 header.b=T7jbyqDv;
spf=pass (google.com: best guess record for domain of
<a href="mailto: ... at example dot org"> ... at example dot org</a> designates 2001:db8:bad::cafe:: as
permitted sender) smtp.mailfrom= ... at example dot org;
dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=example.org

What else can we do? How do you deal with this problem?

Comments

Re: How to avoid being classified as spam by Google?

By Bill Cole at 10/06/2019 - 12:50

The MailOp list is probably a better choice:
<a href="https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop" title="https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop">https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop</a>

Actual Google mail admins respond to such queries there. Really.

Re: How to avoid being classified as spam by Google?

By martin f krafft at 10/06/2019 - 13:03

Quoting "Bill Cole", who wrote on 2019-10-06 at 12:50 Uhr -0400:
Thanks! I didn't know about that. Will re-ask there. Sorry for the
noise.

Re: How to avoid being classified as spam by Google?

By Benny Pedersen at 10/06/2019 - 13:28

martin f krafft skrev den 2019-10-06 19:03:
note NET::ERR_CERT_SYMANTEC_LEGACY

Re: How to avoid being classified as spam by Google?

By Benny Pedersen at 10/06/2019 - 12:57

Bill Cole skrev den 2019-10-06 18:50:

NET::ERR_CERT_SYMANTEC_LEGACY

if recipient keeps mails in spam folder how could google then classifiy
it better ?

Re: How to avoid being classified as spam by Google?

By Benny Pedersen at 10/06/2019 - 12:44

martin f krafft skrev den 2019-10-06 18:36:

dkkim running in test mode ?, see if domain have t= in dns

just guesssing

Re: How to avoid being classified as spam by Google?

By martin f krafft at 10/06/2019 - 13:03

Quoting "Benny Pedersen", who wrote on 2019-10-06 at 18:44 Uhr +0200:
Yes, on some domains it's still running in test mode. Is that enough
reason for Google admins to flick us the finger?