1. [n]  (medieval) flexible armor; made of interlinked metal rings
2. [n]  a conveyance that transports mail
3. [n]  the system whereby messages are transmitted via the post office; "the mail handles billions of items every day"; "he works for the United States mail service"; "in England they call mail `the post'"
4. [n]  the bags of letters and packages that are transported by the postal service
5. [n]  any particular collection of letters or packages that is delivered; "your mail is on the table"; "is there any post for me?"; "she was opening her post"
6. [v]  cause to be directed or transmitted to another place; "send me your latest results"; "I'll mail you the paper when it's written"
7. [v]  send via the postal service; "I'll mail you the check tomorrow"

Mail
Katinka O`Toole, recently out of Harvard and struggling to write, finds that the highpoint of her day is the arrival of the mail--and with it the sexy mailman, Louis Capetti.

more details ...

1. \Mail\, n.
   A spot. [Obs.]
   

2. \Mail\, n. [F. maille, OF. also maaille, LL. medalia. See
   {Medal}.]
   1. A small piece of money; especially, an English silver
      half-penny of the time of Henry V. [Obs.] [Written also
      {maile}, and {maille}.]
   2. Rent; tribute. [Obs., except in certain compounds and
      phrases, as blackmail, mails and duties, etc.]
   {Mail and duties} (Scots Law), the rents of an estate, in
      whatever form paid.
   

3. \Mail\, n. [OE. maile, maille, F. maille a ring of mail,
   mesh, network, a coat of mail, fr. L. macula spot, a mesh of
   a net. Cf. {Macle}, {Macula}, {Mascle}.]
   1. A flexible fabric made of metal rings interlinked. It was
      used especially for defensive armor. --Chaucer.
   {Chain mail}, {Coat of mail}. See under {Chain}, and {Coat}.
   2. Hence generally, armor, or any defensive covering.
   3. (Naut.) A contrivance of interlinked rings, for rubbing
      off the loose hemp on lines and white cordage.
   4. (Zo["o]l.) Any hard protective covering of an animal, as
      the scales and plates of reptiles, shell of a lobster,
      etc.
            We . . . strip the lobster of his scarlet mail.
                                                  --Gay.
   

4. \Mail\, v. t.
   1. To arm with mail.
   2. To pinion. [Obs.]
   

5. \Mail\, n. [OE. male bag, OF. male, F. malle bag, trunk,
   mail, OHG. malaha, malha, wallet; akin to D. maal, male; cf.
   Gael. & Ir. mala, Gr. ? hide, skin.]
   1. A bag; a wallet. [Obs.] --Chaucer.
   2. The bag or bags with the letters, papers, papers, or other
      matter contained therein, conveyed under public authority
      from one post office to another; the whole system of
      appliances used by government in the conveyance and
      delivery of mail matter.
            There is a mail come in to-day, with letters dated
            Hague.                                --Tatler.
   3. That which comes in the mail; letters, etc., received
      through the post office.
   4. A trunk, box, or bag, in which clothing, etc., may be
      carried. [Obs.] --Sir W. Scott.
   {Mail bag}, a bag in which mailed matter is conveyed under
      public authority.
   {Mail boat}, a boat that carries the mail.
   {Mail catcher}, an iron rod, or other contrivance, attached
      to a railroad car for catching a mail bag while the train
      is in motion.
   {Mail guard}, an officer whose duty it is to guard the public
      mails. [Eng.]
   {Mail train}, a railroad train carrying the mail.
   

6. \Mail\, v. t. [imp. & p. p. {Mailed}; p. pr. & vb. n.
   {Mailing}.]
   To deliver into the custody of the postoffice officials, or
   place in a government letter box, for transmission by mail;
   to post; as, to mail a letter. [U. S.]
   Note: In the United States to mail and to post are both in
         common use; as, to mail or post a letter. In England
         post is the commoner usage.
   

1. electronic mail.

2. The Berkeley Unix program for composing and reading electronic mail. It normally uses sendmail to handle delivery.

Unix manual page: mail(1)