Hey Martin, Just my two cents from running a service dedicated to email forwarding; We've been getting a lot of help from the community recently, so I thought I'd contribute as well.
We're often seeing this type of error, and I agree with what Jarland has said previously. Gmail only flags the specific IP of the relays you are using to deliver emails, which explains why only a few emails get picked up out of millions sent per month. I'd do a few things: 1. Find the IP addresses that are constantly getting rejected. I bet you have 2 or 3 IPs that soft-bounce 100% of emails. 2. Try to investigate when it started happening (i.e. getting the first 4.2.1 messages) and see if there was something you forwarded that Gmail could have picked up as obviously malicious or spammy. That's subjective, but sometimes it'll just be evident. 3. Retire the blocked IPs temporarily (we've found that waiting at least a week and restarting slowly works well), or at least prevent them from delivering to Gmail. It also doesn't hurt to fill Google's Bulk Sender contact form <https://support.google.com/mail/contact/gmail_bulk_sender_escalation>, although it's quite an opaque process, and you won't ever get an answer - even if they take action. Hope that helps, Antoine On Thu, Nov 24, 2022 at 8:57 PM Hans-Martin Mosner via mailop < mailop@mailop.org> wrote: > Am 24.11.22 um 17:20 schrieb Martin Flygenring via mailop: > > ... [Google says] Our system has detected an unusual rate of unsolicited > mail originating from your IP address. > > ... > > Now, the interesting part is that for almost 98% of the mails currently > in queue, Google is the original sender of the > > email. > > I don't see a contradiction here. Google is a massive sender of spam, so > it would only be normal to classify their email > as unsolicited... > > Cheers (somewhat tongue-in-cheek), > Hans-Martin > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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