We've been having delivery issues to gmail since November 15 at 12:17 pm (Central). But there's still lots of email going through, too.
Here's an example from our mail server's logs: Failed <snip> rr=Site gmail.com (2607:f8b0:4001:c5a::1a) said after data sent: 550 5.7.1 https://support.google.com/mail/?p=NotAuthorizedError 75-20020a6b144e000000b007a2a17ef77bsi3551757iou.146 - gsmtp 550-5.7.1 [2607:fe28:0:4000::10] The IP you're using to send mail is not\n550-5.7.1 authorized to send email directly to our servers. Please use the SMTP\n550-5.7.1 relay at your service provider instead. Learn" What's interesting is that all the failure come from our email server's IPv6 address, which has been in place for 5+ years and matching FQDN and PTR. Frank -----Original Message----- From: mailop <[email protected]> On Behalf Of Omar Thameen via mailop Sent: Wednesday, November 15, 2023 11:50 AM To: [email protected] Subject: [mailop] Gmail deferrals resolved by transit encryption This might be old news, but we started seeing delivery deferrals to Gmail starting Nov 13 around 4pm EST. It started at about 10% of deliveries, mostly affecting larger accounts, and all having IP and domain reputations in Google Postmaster Tools of high and medium. Messages were delivered on subsequent retries. Last night, when the deferrals increased to 25-30%, we deployed TLS for deliveries, and the deferrals immediately went to zero. Hope that helps others. Omar -- BIGLIST.com _______________________________________________ mailop mailing list [email protected] https://link.edgepilot.com/s/38670079/wgcznbaNmE6bvgR0r99gWA?u=https://list.mailop.org/listinfo/mailop Links contained in this email have been replaced. If you click on a link in the email above, the link will be analyzed for known threats. If a known threat is found, you will not be able to proceed to the destination. If suspicious content is detected, you will see a warning. _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
