This may help - we saw 50k+ of these failures on 7/21. I'm not seeing any since.
Sean On Thu, Aug 1, 2024 at 5:15 PM L. Mark Stone via mailop <[email protected]> wrote: > The A record for outbound.eastex.net yields an IP that's different from > the second PTR record that references that same FQDN. So A > PTR > A > mapping is broken. > > Plus, I seem to recall RFCs recommend not to have more than one PTR record > for the same IP. RFC 1912 and maybe RFC 2181 if I'm remembering correctly. > > Hope that helps, > Mark > > -- > _________________________________________________________________ > L. Mark Stone, Founder > North America's Leading Zimbra VAR/BSP/Training Partner > For Companies With Mission-Critical Email Needs > > ----- Original Message ----- > | From: "Bill Cole via mailop" <[email protected]> > | To: "Mike McTee via mailop" <[email protected]> > | Sent: Thursday, August 1, 2024 4:40:01 PM > | Subject: Re: [mailop] [E] Anyone from sbcglobal.net > > | On 2024-08-01 at 16:26:46 UTC-0400 (Thu, 1 Aug 2024 15:26:46 -0500) > | Mike McTee via mailop <[email protected]> > | is rumored to have said: > || Their server bounces his messages with this error: > > || 550 5.7.1 Connections not accepted from servers without a valid sender > || domain.flph840 Fix reverse DNS for 66.171.0.45 > > || But I sent a test message to his intended recipient and my test message > was > || received. > > || Our DNS has been "as is" for a very long time and we're not getting any > rDNS > || errors from any others. > | They may be having a problem with the existence of 2 PTR records. It's > not > | formally wrong, but it's a good way to generate odd problems with people > who > | try to validate your DNS. > > || On 8/1/24 2:31 PM, Marcel Becker via mailop wrote: > ||| On Thu, Aug 1, 2024 at 12:02 PM Mike McTee via mailop < > [email protected]> wrote: > > ||| We're getting an odd response for one of our customers when they > ||| try to email someone @sbcglobal.net < [ http://sbcglobal.net/ | > ||| http://sbcglobal.net ] >. > ||| Please email me directly if you have insight to that domain and > ||| can assist. > > ||| That's AT&T. And what is the "odd response"? > > ||| _______________________________________________ > ||| mailop mailing list > ||| [email protected] > ||| [ https://list.mailop.org/listinfo/mailop | > ||| https://list.mailop.org/listinfo/mailop ] > || _______________________________________________ > || mailop mailing list > || [email protected] > || [ https://list.mailop.org/listinfo/mailop | > || https://list.mailop.org/listinfo/mailop ] > | [email protected] or [email protected] > | (AKA @[email protected] and many *@billmail.scconsult.com > addresses) > | Not Currently Available For Hire > > | _______________________________________________ > | mailop mailing list > | [email protected] > | https://list.mailop.org/listinfo/mailop > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop > -- Sean Wirt
_______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
