| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| (verb) send or transport by airmail | - |
| airmailer | (noun) a mailer for airmail | - |
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| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| (verb) obtain through threats | - |
| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blackmailer | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: extortioner, extortionist |
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| camail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: aventail, ventail |
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| email | (noun) (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in | Synonyms: e-mail, electronic mail |
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| (verb) communicate electronically on the computer | Synonyms: e-mail, netmail |
| freemail | (noun) a service providing free email delivery in exchange for exposure to advertising | - |
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| greenmail | (noun) (corporation) the practice of purchasing enough shares in a firm to threaten a takeover and thereby forcing the owners to buy those shares back at a premium in order to stay in business | - |
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| mail | (noun) (Middle Ages) flexible armor made of interlinked metal rings | Synonyms: chain armor, chain armour, chain mail, ring armor, ring armour, ring mail |
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| (noun) a conveyance that transports the letters and packages that are conveyed by the postal system | - |
| (noun) the system whereby messages are transmitted via the post office | Synonyms: mail service, post, postal service |
| (noun) the bags of letters and packages that are transported by the postal service | - |
| (noun) any particular collection of letters or packages that is delivered | Synonyms: post |
| (verb) cause to be directed or transmitted to another place | Synonyms: post, send |
| (verb) send via the postal service | Synonyms: get off |
| mailbag | (noun) letter carrier's shoulder bag | Synonyms: postbag |
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| (noun) pouch used in the shipment of mail | Synonyms: mail pouch |
| mailboat | (noun) a boat for carrying mail | Synonyms: mail boat, packet, packet boat |
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| mailbox | (noun) a private box for delivery of mail | Synonyms: letter box |
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| (noun) public box for deposit of mail | Synonyms: letter box, postbox |
| maildrop | (noun) a drop where mail can be deposited | - |
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| mailed | (adjective) wearing protective mail | Synonyms: mail-clad |
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| mailer | (noun) a container for something to be mailed | - |
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| (noun) an advertisement that is sent by mail | - |
| (noun) a person who mails something | - |
| mailing | (noun) the transmission of a letter | Synonyms: posting |
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| (noun) mail sent by a sender at one time | - |
| maillot | (noun) tights for dancers or gymnasts | - |
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| (noun) a woman's one-piece bathing suit | Synonyms: tank suit |
| mailman | (noun) a man who delivers the mail | Synonyms: carrier, letter carrier, mail carrier, postman |
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| mailsorter | (noun) a sorter for sorting mail according to the address | - |
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| netmail | (verb) communicate electronically on the computer | Synonyms: e-mail, email |
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| voicemail | (noun) a computerized system for answering and routing telephone calls; telephone messages can be recorded and stored and relayed | Synonyms: voice mail |
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