Please contact me off list. thanks! *Lili Crowley*
she/her Postmaster <http://www.yahoo.com/> On Tue, Jun 4, 2024 at 10:19 AM Robert L Mathews via mailop < mailop@mailop.org> wrote: > Last Friday, all our mail servers started getting this error when sending > to any addresses @att.net, @sbcglobal.net, etc.: > > 553 5.3.0 flpd576 DNSBL:RBL 521< 208.80.4.152 >_is_blocked.For assistance > forward this error to abuse_...@abuse-att.net > > I've written to the abuse_...@abuse-att.net address twice from different > addresses, but received no response (not even an autoresponse) after > 72 > hours. > > The error appears at the MAIL FROM stage, and it doesn't matter what the > HELO or MAIL FROM text is. The messages would pass SPF/DKIM/DMARC, although > it never gets to the DKIM stage. The blocking is clearly IP based, although > it encompasses all of our IP space (four separate /22 netblocks). We're > sending from the same IP addresses we've been using for 15 years, with no > change in behavior or uptick in complaints, and the servers are not listed > on any publicly accessible RBLs that I can find. > > Are other people seeing anything similar? Does anyone have any tips for > solving this, beyond "keep writing to abuse_...@abuse-att.net"? > > -- > Robert L Mathews > > _______________________________________________ > mailop mailing list > mailop@mailop.org > > https://urldefense.com/v3/__https://list.mailop.org/listinfo/mailop__;!!Op6eflyXZCqGR5I!GXGBLI0WtsF4UPPMMYlSOTUEYT5CQc_XlD2xz-Z5-dIsraPc2swvw-Yj5SaYOgN9TqRnJXinLuB-rkzbGI4$ >
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