> On 24.06.2023 at 06:56 John Levine via mailop wrote: > > It appears that Al Iverson via mailop <aiver...@wombatmail.com> said: >> What if we just got to the heart of the matter and admitted that >> greylisting is useless 2023? > > Because it's still quite useful if you do it sensibly. Here's what my > logs say for the past two years, by number of IPs > > greylist but never retried: 13573 > greylist and did retry: 9299 > > whitelisted or previously retried: 6519 > > More than half of the addresses I greylist never retry, and spot > checks of the logs show that's overwhelmingly bots.
It matters if the greylisting takes place before or after RBL / domain reputation checks. If the greylisting comes first, I could imagine that the connections from most of those bots would have been blocked anyway (with a 5xx response code). I’m writing „most“, as surely greylisting does block spam messages which would otherwise not have been caught, but as with every antispam measure one has to weigh its benefits and costs, especially false positives. Unfortunately greylisting tends to have a lot of false positives and thereby introduces noticeable breakage into email communication. As a commercial ESP I wouldn’t set it up. It’s annoying for the users when they repeatedly have to wait for registration emails, order confirmation with payment details, when they are on the phone with someone and want to discuss a document, which just doesn’t arrive at the other end, and so on. Let alone cases where messages aren’t delivered at all, as can be seen in this thread or in the one just a few days old: „Strange mail delivery from microsoft“ (although the temporary errors in this thread might be due to maintenance work or some software errors, I‘m not sure). — BR Oliver ________________________________ dmTECH GmbH Am dm-Platz 1, 76227 Karlsruhe * Postfach 10 02 34, 76232 Karlsruhe Telefon 0721 5592-2500 Telefax 0721 5592-2777 dmt...@dm.de<mailto:dmt...@dm.de> * www.dmTECH.de<http://www.dmtech.de> GmbH: Sitz Karlsruhe, Registergericht Mannheim, HRB 104927 Geschäftsführer: Christoph Werner, Martin Dallmeier, Roman Melcher ________________________________ Datenschutzrechtliche Informationen Wenn Sie mit uns in Kontakt treten, beispielsweise wenn Sie an unser ServiceCenter Fragen haben, bei uns einkaufen oder unser dialogicum in Karlsruhe besuchen, mit uns in einer geschäftlichen Verbindung stehen oder sich bei uns bewerben, verarbeiten wir personenbezogene Daten. Informationen unter anderem zu den konkreten Datenverarbeitungen, Löschfristen, Ihren Rechten sowie die Kontaktdaten unserer Datenschutzbeauftragten finden Sie hier<https://www.dm.de/datenschutzerklaerung-kommunikation-mit-externen-493832>. _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
