Microsoft and Comcast are a strange combination without some common thread. I’m assuming it’s your mailserver IP and not the customer’s domain being blocked, also that it’s outlook.com or Hotmail.com blocking you, not Microsoft’s paid filtering service I forget what it’s called.
One thing we’ve tried to enforce for a long time is not to allow customers to autofoward their mail. You may get blamed for forwarded spam, plus forwarding may bypass your spam filters. This is hard to enforce if your mailserver offers self-service autoforwarding. I remember we had a realty agency where almost every agent had their email forwarded to their personal email address at Gmail, Yahoo, etc. From: AF <af-boun...@af.afmug.com> On Behalf Of Mike Hammett Sent: Tuesday, December 8, 2020 9:50 AM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] SMTP Spam troubles Microsoft has SNDS. Microsoft and Google are the two hardest I've found to get removal from. ----- Mike Hammett <http://www.ics-il.com/> Intelligent Computing Solutions <https://www.facebook.com/ICSIL> <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> <https://www.linkedin.com/company/intelligent-computing-solutions> <https://twitter.com/ICSIL> <http://www.midwest-ix.com/> Midwest Internet Exchange <https://www.facebook.com/mdwestix> <https://www.linkedin.com/company/midwest-internet-exchange> <https://twitter.com/mdwestix> <http://www.thebrotherswisp.com/> The Brothers WISP <https://www.facebook.com/thebrotherswisp> <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> _____ From: "Nate Burke" <n...@blastcomm.com <mailto:n...@blastcomm.com> > To: "Animal Farm" <af@af.afmug.com <mailto:af@af.afmug.com> > Sent: Tuesday, December 8, 2020 8:50:16 AM Subject: [AFMUG] SMTP Spam troubles I've started having a lot of problems over the last week with my mailserver getting blocked for Spam. I can't find any reason why, but Microsoft/Senderbase/Comcast are blocking me. I'm not on any Blacklists that I can find, MXToolbox shows it clean on all their blacklist checks, and it's not on barracuda's list. My Mailserver traffic is normal, so I don't' think I have any compromised accounts. I can't find anywhere to check/remove the Microsoft blacklist. The Returned SMTP Messages just has a Link to their general FAQ page and a helpful note that says 'We are blocking your email, Contact your network administrator for assistance'. Going directly to Senderbase and looking up My server shows the server clean. I've already told one customer to move their domain off of me, so I don't have to answer their hourly calls wondering when it will be fixed, and I'm getting ready to tell another to leave, since there's nothing that I can find to fix. But it's always MY fault that someone else is not accepting their email. It's never up to the person with the Hotmail or Comcast account complaining to their company that they can't receive mail from this person. Did something recently change with some SMTP Protocol or vague DNS check that I missed updating that the big companies are blacklisting me now? -- AF mailing list AF@af.afmug.com <mailto:AF@af.afmug.com> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
-- AF mailing list AF@af.afmug.com http://af.afmug.com/mailman/listinfo/af_af.afmug.com
