I think Fastmail can deal with this. I don't know about using "-"(dash), specifically, though ... And never use "+" as a separator. There are zillions of shi

I think Fastmail can deal with this. I don't know about using "-"(dash), specifically, though ... And never use "+" as a separator. There are zillions of shitty regex email address "validators" that won't take it even though gmail uses it.