[account42]

> It is relatively expensive to run

Compared to sending a mail or to a customer not getting a mail they wanted?

> Try to keep it as non-restrictive as possible. Something like ^[^@]+@[^@\s]+$, which only makes sure your user has input “something@something”

Requiring a dot in the domain part is perfectly valid. It makes no sense to not validate that the address is in a format that you can actually send something to, which include a domain that you can look up and isn't specifically rejected by your MTA.

> This belief will probably be more commonly held in the English-speaking world, but I’m curious: If you’re not in the Anglosphere, do you still expect emails to require ASCII latin characters?

Yes, I do not trust Unicode with all its ambiguities and alternate forms to resolve to the same identifier on your and that I intended. ASCII-only email addresses are the norm everywhere I have seen.

[artistonn]

> It is relatively expensive to run

yeah, that is a pretty bizarre claim, as if millions of accounts are created per second

frankly this claim makes me think this article is LLM generated, because while the claim is technically correct, it's not a real concern