On Thu, 16 Jun 2022 11:38:00 -0400 Dan Mahoney via mailop <mailop@mailop.org> wrote:
> I'm getting regular spam from google groups. (This week, it's in Arabic). > Since it's google groups, any abuse reports would just be devnulled. > > Sender: -2040---_...@googlegroups.com > List-Archive: <https://groups.google.com/group/-2040---__-- I've also been subscribed to some of these, e.g. --_-2030...@googlegroups.com --2050-_-org_-...@googlegroups.com Since Google Groups Return-Path and Sender headers are fashioned after the group's name, the envelope sender for messages from these groups begins with a hyphen. But the default Postfix configuration doesn't permit such a thing, so these have been getting rejected for many months: In: EHLO mail-ej1-f63.google.com [...] In: MAIL FROM:<--2050-_-org_----+bncbd6lzjuoxierbkv4rokqmgqer6om...@googlegroups.com> SIZE=68726 Out: 501 5.1.7 Bad sender address syntax In: RCPT TO:<xxx> Out: 503 5.5.1 Error: need MAIL command In: DATA Out: 503 5.5.1 Error: need RCPT command In: QUIT Out: 221 2.0.0 Bye I think most list managers would have automatically unsubscribed a recipient after 50+ consecutive failures, but the Google Groups platform is undeterred; it must not recognize this particular pattern as a problem. Shaun _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
