If you’re amenable to creating some sort filters, you can add arbitrary variations using +. Not all web forms accept this (you may need to hack with %2A). Not a

If you’re amenable to creating some sort filters, you can add arbitrary variations using +. Not all web forms accept this (you may need to hack with %2A). Not all mail delivery agents support it, either. But, if me+paypal@domain.foo and me+irs@domain.foo are sending you different volumes of traffic, this could help you filter.