Massive problems with email delivery to Yahoo and AOL today, they share a mail system on the back-end. Microsoft issued advisory EX719348 last Thursday for their IPs being included in some DNSRBLs, and I still see some of their IPs on the Spamhaus RBL (40.107.102.127) but I'm not sure if that's the root cause. All my emails from O365 to Yahoo and AOL have been failing since 3/7. Lots of noise and confusion because Yahoo and AOL recently started enforcing stricter SPF/DKIM/DMARC requirements, but this seems to be unrelated. These emails are DKIM signed, pass SPF, and have a valid DMARC record. Still investigating, will update the list with the eventual resolution. - Cary On Mon, Mar 11, 2024 at 1:27 PM bannereddivpool via Outages < outages@outages.org> wrote:
Anyone seeing any issues with yahoo email services? I keep getting dropped;
telnet mta6.am0.yahoodns.net 25 Trying 67.195.204.74... Connected to mta6.am0.yahoodns.net. Escape character is '^]'. 220 mtaproxy501.free.mail.bf1.yahoo.com ESMTP ready EHLO mail.yahoo.com 250-mtaproxy501.free.mail.bf1.yahoo.com 250-PIPELINING 250-SIZE 41943040 250-8BITMIME 250 STARTTLS Connection closed by foreign host.
Sending from outlook and I'm getting this as well;
*Diagnostic information for administrators:*
Generating server: SJ2PR14MB6550.namprd14.prod.outlook.com Total retry attempts: 7
sample1@yahoo.com <babyereed2013@yahoo.com> Remote server returned '550 5.4.300 Message expired -> 451 [RL01] Message temporarily deferred'
sample2@yahoo.com <jbliqemp@yahoo.com> Remote server returned '550 5.4.300 Message expired -> 451 [RL01] Message temporarily deferred'
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