On 2023-03-01 at 07:05:11 UTC-0500 (Wed, 1 Mar 2023 20:05:11 +0800)
Ken Young <ken@highwinds.cloud>
is rumored to have said:

From my experience, outlook always marks the domains they don't know as
spam.

This is approximately true, as far as I can tell. MS and Google both have problems with their filtering that punish low-volume mail sources, especially those with 'bursty' volume. If you want to deliver a bunch of messages all at once to MS or Google once a month and very little else, you can bet on trouble.

anyway you should have mail-tester to mark your sender scores as high as
possible (10 is the best).

HOWEVER.... (putting on my grumpy ASF SpamAssassin PMC hat)

Disregard mail-tester.com's misuse of SpamAssassin. It does not reflect the real-world use of SA and is chronically out of date, with apparently localized scores applied to obsolete rules. This is enough of a problem that if I see a citation of mail-tester.com in a formal SA bug report, I will reject it as invalid by default. With a scolding.

This is particularly true for deliverability issues with major mailbox providers. They do not use SA.

--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire

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