isEmail accepts &@<domain>

[7c]

Just tried older and newest version;

[MisterXRD]

Do not use this library. Its dead

[WikiRik]

Do not use this library. Its dead

That we haven't had a release in a while doesn't mean the project is dead. We're also actively looking into adding new maintainers to the project, see #2376

[WikiRik]

And now on the issue itself; in the regular expression the & is indeed allowed as part of the email address. It is not different behaviour when &@ are right next to each other.

Not an official source of course, but Wikipedia also mentions this; https://en.m.wikipedia.org/wiki/Email_address#Local-part

So I would not consider this a bug.