I "feel" like there's been an increase but I'm not sure if the numbers
support my gut feeling. Here's some stats I just pulled if you want to
look at them:
https://docs.google.com/spreadsheets/d/14RfO9_RBnQBu4i2lzP4zYMGaQfTDGtNLmcC_E0xQeP4/edit?usp=sharing
On 2023-11-17 08:37, Philip Paeps via mailop wrote:
For the past couple of days, mx2.FreeBSD.org is queuing more mail to
Google than usual.
This is the 421:
421-4.7.28 Gmail has detected an unusual rate of unsolicited mail. To
protect 421-4.7.28 our users from spam, mail has been temporarily rate
limited. Please 421-4.7.28 visit 421-4.7.28
https://support.google.com/mail/?p=UnsolicitedRateLimitError to 421
4.7.28 review our Bulk Email Senders Guidelines.
m17-20020a67f711000000b0045d8a438106si295017vso.199 - gsmtp (in reply
to end of DATA command)
We're not sending out more unsolicited mail than usual. Postmaster
Tools suggests authentication, spam rates, etc etc etc all unchanged.
We do all the things in the Bulk Sender Guidelines (except DMARC
because we don't want to frustrate our users ability to use third-party
mailing lists that don't mitigate it). We add ARC headers to all our
outbound mail.
Since about September, we're hitting the rate limiter ~70% of the time
every couple of days. Since ~15 November we're hitting the rate
limiter for almost all mail we send.
Anyone else noticing this?
(We run hundreds of mailing lists (all of them confirmed opt-in, of
course) and have dozens of plain forwarding aliases. Our spam
filtering is pretty effective but there will always be some spam.)
Brandon: any insights? Happy to supply more logs.
Best wishes.
Philip
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