On 2025-05-01 at 19:18:42 UTC-0400 (Thu, 1 May 2025 16:18:42 -0700)
Joe Muller via mailop <joe.mul...@sonic.com>
is rumored to have said:
We have a colocated customer who is reporting their outbound mail is
being rejected when emailing gmail.com addresses.
The customer's mail server is at 157.131.30.2, part of a larger block
we are using for business static IP customers. The message their
receive from Google (on 20250426) is as follows:
<redac...@gmail.com>: host gmail-smtp-in.l.google.com[142.251.2.26]
said:
550-5.7.1 [157.131.30.2] The IP you're using to send mail is not
authorized
to 550-5.7.1 send email directly to our servers. Please use the SMTP
relay
at your 550-5.7.1 service provider instead. For more information, go
to 550
5.7.1 https://support.google.com/mail/?p=NotAuthorizedError
41be03b00d2f7-b15f88876f4si8236173a12.185 - gsmtp (in reply to end of
DATA
command)
That message is what Google says when your SPF record doesn't include
the sending IP. They MAY also use that to respond to DKIM failure.
Does Google operate its own list similar to the SpamHaus PBL that
would cause mail to be rejected? A lookup in SpamHaus' tool shows no
problems.
Google does not discuss their spam filtering tactics publicly. They
probably have one or more IP blocklists, but none which they publish.
Anyone here from Google or with similar experience willing to contact
me on or off-list with more information? Thanks.
Occasionally we are graced by the presence of people from Google who
have said helpful things about how to get delivered by Google, generally
rephrasing Google's own documentation. I don't believe we've seen them
recently.
--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo@toad.social and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire
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