FOSDEM
4 HN mentions · mentioned in 4 months, 2019–2025
16:26 · 27K views · Feb 10, 2018
Stavros Korokithakis gives a FOSDEM 2018 talk on how hard it is to validate email addresses properly, taking a tour through RFC 5321.
Linked whenever email validation comes up as a fun illustration of how deceptively difficult it is.
4 comments from Hacker News
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.
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.
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.
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.