Hi,
It is postfix, and has DNS, SPF and DKIM set up correctly.
Are you sure about this? Did you check your configuration, for example
with check-a...@verifier.port25.com (mail-based) or mail-tester.com
(web-based)?
Another way to check what happens is to send an email to a Gmail address
you control, and look at the raw message to see why it is flagged as spam.
For example, I see that your email address is @jfoo.org, and that you
have:
jfoo.org. 6 IN MX 0 mx.oustrencats.com.
jfoo.org. 6 IN TXT "v=spf1 ip4:50.116.29.164 ip6:2600:3c00::f03c:91ff:fe6e:7287
-all"
This is not optimal, your SPF record should be "v=spf1 mx ?all".
Your server is apparently part of the Linode network, so there is no
reason it should have a bad reputation.
There were 19 recipients on the To: line.
A common "netiquette" rule is that you should never send emails with many
recipients in the To: line, they should be in the Bcc: line. I personally
consider that "many" means "more than five".
Gregory
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