Monday, February 22, 2021

RFC7505 Means Yes, Your Domain Can Refuse to Handle Mail. Please Leave Us a TXT If You Do.

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If you do not want a domain to receive any mail, there is a way to be at last somewhat civil about it. There's a different DNS trick for...
Friday, February 28, 2020

The 'sextortion' Scams: The Numbers Show That What We Have Is A Failure Of Education

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Subject: Your account was under attack! Change your credentials! From: Melissa <chenbin@jw-hw.com> To: adnan@bsdly.net Hello! I am a h...
5 comments:
Saturday, December 28, 2019

The Year 2019 in Review: This Was, Once Again, Weirder Than the Last One

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The year is 2019. By now Blade Runner is a movie about the past, but there are still bots out there trying to guess our passwords. It gets ...
Sunday, November 4, 2018

Goodness, Enumerated by Robots. Or, Handling Those Who Do Not Play Well With Greylisting

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SMTP email is not going away any time soon. If you run a mail service, when and to whom you present the code signifying a temporary local pr...
Monday, August 13, 2018

Badness, Enumerated by Robots

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A condensed summary of the blocklist data generated from traffic hitting bsdly.net and cooperating sites. After my runbsd.info entry  (pr...
Sunday, April 1, 2018

ed(1) mastery is a must for a real Unix person

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ed(1) is the standard editor. Now there's a book out to help you master this fundamental Unix tool. In some circles on the Internet, ...
6 comments:
Saturday, February 17, 2018

A Life Lesson in Mishandling SMTP Sender Verification

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An attempt to report spam to a mail service provider's abuse address reveals how incompetence is sometimes indistinguishable from malice...
4 comments: