[outages] yahoo

[Cary Wiedemann]

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 at 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 at yahoo.com <babyereed2013 at yahoo.com>
> Remote server returned '550 5.4.300 Message expired -> 451 [RL01] Message
> temporarily deferred'
>
> sample2 at yahoo.com <jbliqemp at yahoo.com>
> Remote server returned '550 5.4.300 Message expired -> 451 [RL01] Message
> temporarily deferred'
>
> Original message headers:
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