steve lund writes:
> Seems like Google is mucking about with its filters!
That's their raison d'etre. (It certainly can't be their execrable
UI.)
They do a good job at filtering, and it gets better over time.
Sometimes they make mistakes. Users want them to shoot first and ask
questions later. They're pretty good (too good when it comes to
mailing list test messages :-( ) about resisting user pressure to
change their filtering practices.
> > If I had to guess though, the next most likely thing after DMARC is the
> > sending server was blacklisted by some recipient domains.
> This is what I was afraid of. Is there any way of confirming or denying
> that this is happening.
Not individual domains, without asking them directly. However, most
likely rather than doing their own blocking, they subscribe to a block
list ("black hole"). There are free services that will check the
major block lists for you. I have a meeting in 5 minutes so no time
to look up now, maybe after work if nobody else chimes in.
> So how does an ISP keep their mail server OFF of the SPAM
> blacklist?
Get the DNS in order (MXes have A records, A records round-trip
through PTR, DKIM, DMARC, and SPF configs are present, correct DKIM
pubkey is present). Configure DKIM signing and ARC sealing in the
MTA. Subscribe to various reporting services at major email providers
(Google, Yahoo!, outlook, o365, hotmail, others). It's a PITA.
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Steve
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