So you think you can validate email addresses A journey down RFC5321

This is fun, but it feels suspiciously close to my old presentation about the exact same thing: ▶ this video Maybe it's just a coincidence, but a shoutout would have been nice if not.

I gave a very fun talk on the topic in FOSDEM (VOLUME WARNING!): ▶ this video It's more a joke than edifying, but it was very fun for me (and, I think, the audience), and illustrates the difficulty of email validation well.

always relevant: "So you think you can validate email addresses": ▶ this video Which is also why proposals to put email certs (S/MIME, OpenPGP) in the DNS led to hashing the local part, as DNS only allows ASCII and is case insensitive.

The email standard does include the +, yes. Here's a talk on the topic: ▶ this video But yes, that's why Fastmail supports the alternative syntax.