Mono Font 2026-06-06T22:54:55-04:00 TL;DR: Don't overthink it, just send a verification email. Bear with me, because some of these “lies” are going to feel obvious, or like unimportant trivia. In all honesty, that’s not that far from the truth. However, I hope you’ll let me try to build a detailed and fun illustration showing how something as mundane as email can break our expectations in surprising ways. We’ll cover a lot of edge cases, stumble over some small blocks, and even discover a few technically-correct things that are valid, but not commonly supported even in big systems like Gmail (probably for good reason, to be fair). Each example isn’t necessarily meant to be a meaningful use-case that you need to go make sure you’re handling correctly. But, all together, they’re meant to gradually build toward one main point: Email addresses are mired in old history, and the definitions of valid and invalid components of the system continue to subtly change over time.…