> 20. sep. 2021 kl. 23:10 skrev Jaroslaw Rafa via mailop <mailop@mailop.org>: > > Dnia 20.09.2021 o godz. 19:40:24 Peter N. M. Hansteen via mailop pisze: >> >> if you do reach a human there, could you do us all a favor and ask >> them whether they still believe in the tooth >> fairy^H^H^H^H^H^H^H^H^H^H^H^HSMTP callbacks and show them >> https://bsdly.blogspot.com/2017/08/twenty-plus-years-on-smtp-callbacks-are.html? > > I think you're wrong claiming in that article that SMTP callbacks are "only > verifying in a very limited sense that the domain's mail exchanger was > indeed equipped with a functional SMTP service." They verify much more than > that, they verify whether the target address actually exists.
I am quite aware of what the intention behind the proposed mechanism was. However, the concept never went beyond the experimental stage, never reached anything near critical mass adoption and has now been deprecated for decades. Besides, what we are seeing does not at all match the behavior you describe. The requests are consistently for some generated string that is pretty much guaranteed not to be a deliverable address. The most generous interpretation I an offer of what I see is that the other end is trying to use a mechanism that essentially nobody else has enabled and that they do not actually understand the mechanism they are attempting to use. And anyway the number of sites that attempt this is low enough that the volume never really rises above the level of background noise. I’m just not that happy with noise in any system. - Peter — Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
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