Certainly seems to be - the error is quite clear. You might want to check the usual? Hacked script originating or proxying spam (sometimes not even through your mta), forwarding users onto yahoo and spam that misses your inbound filtering is being forwarded on?
It’d save these periodic emails to the list that are all “is provider x here and can they assist with a block” --srs ________________________________ From: mailop <mailop-boun...@mailop.org> on behalf of Scott Mutter via mailop <mailop@mailop.org> Sent: Tuesday, June 25, 2024 7:08:09 AM To: mailop@mailop.org <mailop@mailop.org> Subject: [mailop] Yahoo/AOL Blocking Anybody from Yahoo/AOL able to assist with what's causing the IP address - 67.222.148.107 - to be blocked? All messages from 67.222.148.107 will be permanently deferred; Retrying will NOT succeed. See https://postmaster.yahooinc.com/error-codes Messages have DKIM and DMARC IP is not listed in Spamhaus (or any other RBL) Does not seem to be message specific, seems to be IP related.
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