2. Armour, a defensive covering made of metal, or the hard covering of an animal: When going to battle, knights often wore mail to protect themselves.
The turtle has a hard shell, like mail, that helps to protect it from harm; so, the mail of the turtle protects it from predators.
2. Characteristic of men, or being masculine: Many sports that were considered appropriate only for a male player are now being played by women.
The man's wife was complaining that there was nothing in the postbox except more male mail.
Because he was expecting some delicately contentious mail, the often flirtatious male in the office commented he’d better put on his mail before opening his daily mail.
A secretary was talking with a colleague, "I hate junk mail."
Her fellow worker responded with, "Me, too, and there's one now," as she nodded toward her boss as he was just entering the office [referring to him as, "junk male"].
A woman likes a male best who has a will of his own . . . made out in her name.
2. The electronic transmission of letters, messages, and memos via a communications network; now more often via computer connections.
3. A system for sending messages by computer, Telex, facsimile telegraph, or other electronic means instead of by post.
4. Messages sent by one user of a computerized communications system and retrieved almost instantly by other users.
The messages may be transmitted with a modem through telephone lines or, in some cases, by shortwave radio and it can be in many forms, including mailgrams, twx, and facsimile transmission devices.
Mailbots are often used to send out-of-office replies, but can be made to send back any message.