oh god oh no oh shit
(No we're not starting a union (It's a small independent company, not necessarily out of the question but the owners are pretty good so it's not necessary yet) and yes the contents of the email were explicitly about union busting)
At least the built-in spam detection rules agreed with me that this was trash
Also known as Adventures in the Spam Filter chapter 3
the spam filter uses regex for any conditionally matching string you put into it, you don't select if you want a literal string or regex
So if I make a whitelist entry for, say, "dor.mo.gov", the Missouri Department of Revenue's website (and also the domain they send emails from), oops, "." is regex's wildcard character, so that also means a sender like "dorFmoUgov" gets through on the same whitelist rule
I'm going to have to go back and escape a shitload of periods