Is there a way to use your own domains with Leemail (or alternative services, if any)? I'd love a way to be able to shut off addresses when a provider's email d

Is there a way to use your own domains with Leemail (or alternative services, if any)? I'd love a way to be able to shut off addresses when a provider's email database gets hacked. Right now I'm just making do with a Google Apps catchall.