FWIW, we use a custom SpamAssassin negative rule that adds to an email's score if the sender's TLD is not in a list of TLDs from which our customers receive legitimate email.
Typically, emails from those tertiary TLDs get some positive SpamAssassin score already, and our rule's score then puts them over the top and into customers' Junk folders. We developed the list of "allowed" TLDs by polling our customers, and only a small handful of additional TLDs have had to be added later, when a customer realized they neglected to mention a TLD from which they receive infrequent, but legitimate email. The rule looks like this (I'm not including all the TLDs we allow): header MCE_FROM_TLD From !~ /@[a-z0-9\-\.]+\.(com|mil|org|<other desired TLDs>)/i describe MCE_FROM_TLD From address is not in a preapproved TLD score MCE_FROM_TLD 3.5 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: "Mark E Jeftovic via mailop" <mailop@mailop.org> | To: "Michael Rathbun" <m...@honet.com> | Cc: "Jeff Pang via mailop" <mailop@mailop.org> | Sent: Wednesday, July 10, 2024 3:11:01 PM | Subject: Re: [mailop] Domains discrimination | There was a time when we just flat out blocked .top .click and a few others and | absolutely nobody noticed or cared. | | .xyz is slightly unique as it was the first legacy TLD to support Ethereum Name | Service so a lot of legit crypto sites and projects use xyz names | | | Sent from my iPhone | |> On Jul 10, 2024, at 11:58 AM, Michael Rathbun via mailop <mailop@mailop.org> |> wrote: |> |> On Thu, 11 Jul 2024 02:44:50 +0800, Jeff Pang via mailop <mailop@mailop.org> |> wrote: |> |>> Is there domain name discrimination in the email industry? For example, |>> com, net, and org are considered to have higher reputations, while info, |>> xyz, and top are considered to have lower ratings. The latter do attract |>> a lot of spam because they are cheaper in the first year. Will this |>> lower the ratings of these domain names? |> |> Sometimes, if you happen to note that 97.6% of ".xyz" traffic is spam, you |> hear a "sproing!" that tells you that you can cut your overall costs by |> sending those items to the gravel pit with a "22 out of 7.5" spam rating. |> |> mdr |> |> _______________________________________________ |> mailop mailing list |> mailop@mailop.org |> https://list.mailop.org/listinfo/mailop | _______________________________________________ | mailop mailing list | mailop@mailop.org | https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
