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)
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.
Anyone here from Google or with similar experience willing to contact me
on or off-list with more information? Thanks.
-- Joe Muller
System Operations
Sonic.
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