Mailable 

When regular postal services can be used for delivery purposes.

I had my laptop picked up by courrier because it's not mailable.

Mailable by Frenchfrog1967 October 17, 2008

mainable 

Mainable is someone who has girlfriend/ boyfriend qualities. Either their looks or personality. Therefore you'd main them which is basically date them.

Girl: "He fine and dresses nice girl, he's definitely mainable."

mainable by Ybm December 8, 2015