A lot of posts in this thread are conflating two separate but related topics. Statically typing a string as EmailAddress does not imply validating that the string in question is a valid email address. Both operations have their merits and downsides, but they don't need to be tied together.

Having a type wrapper of EmailAddress around a string with no business logic validation still allows me to take a string I believe to be an email address and be sure that I'm only passing it into function parameters that expect an email address. If I misorder my parameters and accidentally pass it to a parameter expecting a type wrapper of UserName, the compiler will flag it.

Recently got a bank account which allowed my custom domain during registration, but rejected it as invalid during login. The problem? Their JS client code has a bad regex rejecting TLDs longer than 4 chars (trivial for a dev to bypass, but wow.)