Yeah, double dashes is not allowed in rfc821 mailboxes unless quoted, I wondered about that myself. I guess the current groups impl isn't enforcing those rules correctly, or maybe expects the mail server to quote them.
In reality, most mail servers don't interpret addresses that strictly, and I know we made that mistake early on for gmail too. I have no idea what the current bounce handling looks like, but at least in the past I think it would mark a user as potentially bouncing, and then any message that made it through would unset that potentially bouncing state, so it could differentiate between "blocking one message", "blocking all messages" and "user doesn't exist". So, if you're on another mailing list that the mail does get through on, your bouncing state doesn't last. Brandon On Fri, Jun 17, 2022 at 9:50 AM Shaun via mailop <mailop@mailop.org> wrote: > 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 >
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