Shh! Don't tell the spammers, but… Other than DMARC, the only anti-spam technique I employ is greylisting. The last time I received a spam message, it was due to my failure to verify DMARC on incoming mail. See, this is why the big providers are making a big deal about DMARC. I wrote briefly about both in BÚÉK! and Spam. Here, I expand upon greylisting.

I have tried to find a way to show custom headers when reading mail using Emacs and mu4e. Unfortunately, I never did. However, I find a way to show arbitrary custom headers in Thunderbird, which is fantastic! In Config Editor, you can add a list of headers separated by spaces to `mailnews.headers.extraExpandedHeaders`.

I finally started getting spam. Well, phishing emails, technically. From one specific source, some random VM probably purchased for just the occasion. No matter, checking the headers, I found DMARC would have successfully failed it. (Successfully failed? That's a thing, right?)

On occasion, I post quippy "pro tips" to Mastodon using the hashtag #ProTip. When I do, I try to be somewhat witty, but snark overcomes me, because they are often written at a moment when I experience the very problem I am describing. They seem like suitable topics upon which to expound, and I frequently think I should write about them. Then, I don't.

It's the time of the year, Advent of Code is in swing. I am behind, having only just completed day 3. And of course, the obvious solution is a regular expression.