Cyril - ImprovMX via mailop wrote on 2022-04-05 03:28:
Hi everyone!
Two weeks ago, we had two ranges of IP blocked by GMail and since they
are a black box, we were in the dark about what would happen with the ban.
...
Clearly, someone used the reputation of ImprovMX.com to deliver emails
by forging them before delivery.
when this happened to my primary outbound IP, it turned out to be that
google e-mail addresses were signing up en masse for mailman lists here,
and the resulting confirmation e-mail from mailman was seen by google as
spam. i've since turned off confirmation e-mail, and i've added SPF
checking to the inbound e-mail path.
...
After around a week, we restarted the IP and they were accepted by
Gmail! We haven't received any responses from the form we submitted, nor
from anywhere else.
when this happened to me, it went on for months. i hired an outbound
e-mail delivery service and taught postfix how to route mail to google's
MX servers through that service. this was fraught with pain, and so i
eventually renumbered my primary outbound server to a different IP in
the same /24. problem "solved".
...
My key takeaway here in case your IPs are banned by Gmail is:
* First - and most importantly - find and stop the root cause of the
problem
* If you can, stop sending with these IPs (after fixing the issue,
otherwise you'll get your other IP listed too!)
* Reach out to Gmail via
https://support.google.com/mail/contact/bulk_send_new
* Try restarting your IP from time to time.
tyvm, i wish i had had this guidance available when this happened to me.
...
I hope this will help some of you. Being blocked by Gmail is hard, and
facing a black box makes it even harder. You don't know where to look,
you don't know what to do, you don't know who to reach out to.
at MAPS we got sued a lot, but we always answered requests for removal
from the RBL. what google is doing is an active harm which discredits
the whole field of distributed reputation. there should never be
deliberate operational impact without transparency and accountability.
... but the general feeling was clearly that Gmail is not on this world.
May your IPs stay out of DNSBLs.
yes, and yes.
--
P Vixie
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