As a verb, this first name means to send mail free of charge
[DOC] [TLE] Mail - definition of mail by The Free Dictionary [PAR] Used with the, sometimes in the plural: used the mail to send the supplies; .... 
Mail is also sometimes used in British English, for example in the name Royal .... 
special delivery - mail that is delivered by a special carrier (for an additional 
charge) ... Verb, 1. mail - send via the postal service; "I'll mail you the check 
tomorrow".