Unfortunately, automated bounce handling to know what means "no more mails will ever go to this address" vs "some other mail might work" is not an exact science.
Ie, mailman gets confused at DMARC rejects. The bounce handling when I worked on Y!Groups was very complicated, and involved sending periodic test messages over months. The bounce handling for Google Groups doesn't send test messages, it instead piggybacks on the regular messages going to the group, but it can still be fooled by specific types of bounces after the first hop. Also, an ESP may or may not share the bad email message information between different clients. I can imagine arguments in both directions on that that are independent of "money" costs (if you're making all your money by charging to send messages that bounce, you don't have a sustainable business model) Brandon On Wed, Mar 22, 2017 at 1:49 PM, Maarten Oelering <maar...@postmastery.net> wrote: > Most “bulk mailers” will unsubscribe or suppress addresses if they get a > SMTP reply or DSN which indicates that the domain or mailbox is invalid. > > If the SMTP reply is a reject on a wider scope, such as IP, then they > should look into the spam issue, but probably won’t unsubscribe the address. > > Maarten Oelering > > > On 22 Mar 2017, at 20:29, Petar Bogdanovic <pe...@smokva.net> wrote: > > > > Do commercial bulk-mailers count delivery failures? > > > > Because this: > > > > Mar 15 17:34:53 connect: host=mtaout-202-ewr.sendlabs.com > addr=216.146.33.202 > > Mar 15 17:34:54 helo: name=mtaout-202-ewr.sendlabs.com > > Mar 15 17:34:54 envfrom: from=bounces+petar=smokva.net@ > dynect-mailer.net > > Mar 15 17:34:54 envrcpt: rcpt=pe...@smokva.net > > Mar 15 17:34:54 envrcpt: dnsbl_query: addr=216.146.33.202 > dnsbl=bl.local result=127.0.0.5 > > Mar 15 17:34:54 envrcpt: match: stage=envrcpt rule=1 line=21 > reply=REJECT > > Mar 15 17:34:54 close > > > > Mar 16 10:02:50 connect: host=o135.p9.mailjet.com addr=87.253.234.135 > > Mar 16 10:02:50 helo: name=o135.p9.mailjet.com > > Mar 16 10:02:50 envfrom: from=x...@bnc3.mailjet.com > > Mar 16 10:02:50 envrcpt: rcpt=x...@xxx.xxx > > Mar 16 10:02:50 envrcpt: dnsbl_query: addr=87.253.234.135 > dnsbl=bl.local result=127.0.0.5 > > Mar 16 10:02:50 envrcpt: match: stage=envrcpt rule=1 line=21 > reply=REJECT > > Mar 16 10:02:50 close > > > > has been going on for months (maybe years). > > > > I remember mailing-lists unsubscribing addresses after N bounces, why is > > that different with bulk-mailers? > > > > _______________________________________________ > > mailop mailing list > > mailop@mailop.org > > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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