Sorry, was out last week on a much needed bit of Vacationing.
At Microsoft, using this technique will almost certainly cause your IP Reputation to suffer greatly. Also, this does nothing to detect or limit the effect of "One Hit and you're Listed" Spamtrap-based DNSBLs. Aloha, Michael. -- Michael J Wise Microsoft Corporation| Spam Analysis "Your Spam Specimen Has Been Processed." Open a ticket for Hotmail<http://go.microsoft.com/fwlink/?LinkID=614866> ? -----Original Message----- From: mailop <mailop-boun...@mailop.org> On Behalf Of Jaroslaw Rafa via mailop Sent: Sunday, November 24, 2019 5:24 AM To: Tom Ivar Helbekkmo <t...@hamartun.priv.no> Cc: Rolf E. Sonneveld <r.e.sonnev...@sonnection.nl>; Rolf E. Sonneveld via mailop <mailop@mailop.org> Subject: [EXTERNAL] Re: [mailop] Best strategy to prune address list Dnia 23.11.2019 o godz. 20:05:07 Tom Ivar Helbekkmo via mailop pisze: > In the olden days, one would simply write a script, using expect(1) or > similar, to go through the addresses, connect to the target MTAs, and > do an SMTP VRFY on the recipient address. Today, I suspect that most > MTAs will refuse to service a VRFY request. SMTP VRFY was basically never widely adopted. There were always many mail servers that didn't accept VRFY. That's why MTAs that have "sender verification" feature on incoming mail do it by just trying to send mail back to the sender and checking the reply they get on RCPT command. If RCPT is accepted, they assume the e-mail address exists (and accept mail from that sender), if it is rejected, they reject the incoming mail too, assuming the sender doesn't exist. After that, they just send RSET, cancelling the send attempt. As someone already noted, there are also standalone tools that implement the same technique. However, I don't know what impact on reputation could have a large-scale use of this address verification method. -- Regards, Jaroslaw Rafa r...@rafa.eu.org<mailto:r...@rafa.eu.org> -- "In a million years, when kids go to school, they're gonna know: once there was a Hushpuppy, and she lived with her daddy in the Bathtub." _______________________________________________ mailop mailing list mailop@mailop.org<mailto:mailop@mailop.org> https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fchilli.nosignal.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fmailop&data=02%7C01%7Cmichael.wise%40microsoft.com%7C0581ceb9e9a14eedccf808d770e23798%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637101989210958321&sdata=jVBFUIgI2iaSoLrOLat1PYEm7upJU2arYsN86nlHER8%3D&reserved=0
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