There were smaller folks who did tarpit heavily and there was likely badly written spamware, but neither of those were cases I was thinking about.
I’m, basically, quoting one of the mail engineers from one of the large mailbox providers. They implemented limits to connections and limits to number of emails per connection based on specific malicious behavior from spammers. laura > On 6 Sep 2019, at 11:24, Dave Holmes <d...@instiller.co.uk> wrote: > > I remember that IIRC a lot of that was down to the receiving mail server > tar-pitting perceived spam connections to deter. However a lot of software > was so crude it had no connection timeouts and just sat there - haven't seen > that behaviour in a very long time :) > > On Fri, 6 Sep 2019 at 11:08, Laura Atkins via mailop <mailop@mailop.org > <mailto:mailop@mailop.org>> wrote: > There was a point in time where if you didn’t limit the number of messages > per session a few of the larger mailbox providers would simply cut you off. > The issue was some spammers were making hundreds of connections and then > holding them open for days (yes, really, more than 24 hours at a time). A few > of the big mailbox providers addressed this by limiting the number of > connections from a single IP and limiting the number of emails you could send > down a connection before disconnecting and reconnecting. > > laura > > >> On 5 Sep 2019, at 16:31, Brotman, Alexander via mailop <mailop@mailop.org >> <mailto:mailop@mailop.org>> wrote: >> >> One of the interesting things I’ve learned while interacting with ESPs is >> that some of them will artificially restrict the number of messages per >> session, in lieu of opening more sessions. Some of them have told me the >> values are in the low single digits. I’ve kind of wondered the rationale for >> that might be. Is it the idea that you want to get your messages through as >> quickly as possible? >> >> -- >> Alex Brotman >> Sr. Engineer, Anti-Abuse & Messaging Policy >> Comcast >> >> From: mailop <mailop-boun...@mailop.org <mailto:mailop-boun...@mailop.org>> >> On Behalf Of Benjamin BILLON via mailop >> Sent: Thursday, September 5, 2019 10:08 AM >> To: mailop@mailop.org <mailto:mailop@mailop.org> >> Subject: [EXTERNAL] Re: [mailop] Resolving issues for several yahoo domains? >> >> > Hate to imagine how much mail is currently trying to get into Yahoo and >> > AOL >> Same. Hate also to imagine the day (and night?) of the folks working on >> fixing that. >> >> -- >> Benjamin >> >> >> From: Dave Holmes <d...@instiller.co.uk <mailto:d...@instiller.co.uk>> >> Sent: jeudi 5 septembre 2019 15:57 >> To: Benjamin BILLON <bbil...@splio.com <mailto:bbil...@splio.com>> >> Cc: mailop@mailop.org <mailto:mailop@mailop.org> >> Subject: Re: [mailop] Resolving issues for several yahoo domains? >> >> Not the quickest or easiest to do as a lot of senders will have different >> limits on different IP pools depending on reputation / previous throughput. >> >> I've dropped in a platform wide rule to back off the mail queues when the >> response is encountered - should do the Job. >> >> Hate to imagine how much mail is currently trying to get into Yahoo and AOL >> >> On Thu, 5 Sep 2019 at 14:39, Benjamin BILLON via mailop <mailop@mailop.org >> <mailto:mailop@mailop.org>> wrote: >> Yes, everyone. >> Some, very few, emails are accepted. I believe their servers are overloaded. >> I suggest everyone to back off a bit, for instance by limiting the number of >> concurrent connections per outbound IP to ... 1. Until it gets better. >> Forcing our way through is not gonna work, or help. >> >> The DNS issue seems solved now. >> >> -- >> Benjamin >> >> >> From: mailop <mailop-boun...@mailop.org <mailto:mailop-boun...@mailop.org>> >> On Behalf Of Dave Holmes via mailop >> Sent: jeudi 5 septembre 2019 15:21 >> To: Ewald Kessler | Webpower <ewald.kess...@webpower.nl >> <mailto:ewald.kess...@webpower.nl>> >> Cc: mailop <mailop@mailop.org <mailto:mailop@mailop.org>> >> Subject: Re: [mailop] Resolving issues for several yahoo domains? >> >> Were seeing large mail queues forming on our side but I think this extends >> beyond the DNS I've not come across this message from Yahoo before. >> >> Error: "421 Service not available, closing transmission channel tnmpmscs" >> >> So whilst we have the DNS resolution (possibly cached) they are dropping >> connections all over the place, same goes for all of their other domains. >> >> Anyone else with issues delivering after DNS resolves >> >> >> On Thu, 5 Sep 2019 at 10:31, Ewald Kessler | Webpower via mailop >> <mailop@mailop.org <mailto:mailop@mailop.org>> wrote: >> Yes, Oath (a.o. Yahoo, AOL) is having serious issues. Their engineers are >> working to resolve the issues. >> >> Regards, >> Ewald >> >> On Thu, 5 Sep 2019 at 10:35, tobisworld--- via mailop <mailop@mailop.org >> <mailto:mailop@mailop.org>> wrote: >> We're currently seeing several yahoo domains (ex yahoo.de >> <http://yahoo.de/>) cannot be >> resolved any more in DNS. All the responsable nameservers for that >> domain do not reply anymore. Only ns4.yahoo.com <http://ns4.yahoo.com/> >> replies from time to >> time for yahoo.de <http://yahoo.de/> but according to glue record >> ns4.yahoo.com <http://ns4.yahoo.com/> is not in >> charge for yahoo.de <http://yahoo.de/> anymore. >> >> anyone else seeing such problems with yahoo? >> >> -- >> Cheers >> >> tobi >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org <mailto:mailop@mailop.org> >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> <https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop> >> >> >> -- >> Deliverability & Abuse Management, www.webpower-group.com >> <http://www.webpower-group.com/> >> ewald.kess...@webpower.nl <mailto:ewald.kess...@webpower.nl> >> t: +31 342 423 262 >> li: www.linkedin.com/in/ewaldkessler >> <http://www.linkedin.com/in/ewaldkessler> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org <mailto:mailop@mailop.org> >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> <https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop> >> >> >> -- >> >> <image002.jpg> <https://www.instiller.co.uk/> >> >> Dave Holmes >> Technical Director >> >> d...@instiller.co.uk <mailto:d...@instiller.co.uk> >> T 0333 939 0013 | M 07966 013 309 >> 1 Park Farm Barns | Packington Lane | Stonebridge | CV7 7TL >> >> >> >> Instiller is a trademark of Instiller Limited, registered in England 5053657. >> >> This email contains proprietary information, some of which may be legally >> privileged. It is for the intended recipient only. >> If an addressing or transmission in error has misdirected this email, please >> notify the author by replying to this email. >> If you are not the intended recipient, you must not use, disclose, >> distribute, copy, print or rely on this email. >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org <mailto:mailop@mailop.org> >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> <https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop> >> >> >> -- >> >> <image002.jpg> <https://www.instiller.co.uk/> >> >> Dave Holmes >> Technical Director >> >> d...@instiller.co.uk <mailto:d...@instiller.co.uk> >> T 0333 939 0013 | M 07966 013 309 >> 1 Park Farm Barns | Packington Lane | Stonebridge | CV7 7TL >> >> >> Instiller is a trademark of Instiller Limited, registered in England 5053657. >> >> This email contains proprietary information, some of which may be legally >> privileged. It is for the intended recipient only. >> If an addressing or transmission in error has misdirected this email, please >> notify the author by replying to this email. >> If you are not the intended recipient, you must not use, disclose, >> distribute, copy, print or rely on this email. >> >> _______________________________________________ >> mailop mailing list >> mailop@mailop.org <mailto:mailop@mailop.org> >> https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >> <https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop> > -- > Having an Email Crisis? We can help! 800 823-9674 > > Laura Atkins > Word to the Wise > la...@wordtothewise.com <mailto:la...@wordtothewise.com> > (650) 437-0741 > > Email Delivery Blog: https://wordtothewise.com/blog > <https://wordtothewise.com/blog> > > > > > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org <mailto:mailop@mailop.org> > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop > <https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop> > > > -- > > <https://www.instiller.co.uk/> > Dave Holmes > Technical Director > > d...@instiller.co.uk <mailto:d...@instiller.co.uk> > T 0333 939 0013 | M 07966 013 309 > 1 Park Farm Barns | Packington Lane | Stonebridge | CV7 7TL > > > Instiller is a trademark of Instiller Limited, registered in England 5053657. > > This email contains proprietary information, some of which may be legally > privileged. It is for the intended recipient only. > If an addressing or transmission in error has misdirected this email, please > notify the author by replying to this email. > If you are not the intended recipient, you must not use, disclose, > distribute, copy, print or rely on this email. -- Having an Email Crisis? We can help! 800 823-9674 Laura Atkins Word to the Wise la...@wordtothewise.com (650) 437-0741 Email Delivery Blog: https://wordtothewise.com/blog
_______________________________________________ mailop mailing list mailop@mailop.org https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop
