A system of commerce in which one orders goods from a remote store which are then shipped by mail.

(Internet) A device or program that routes an e-mail to the correct destination.

(US) A category of mail in the US Postal Service including registered, numbered, insured, and certified mail.

(uncountable, networking) Email (the system). / (countable, dated) An email.

(retronym) Mail sent physically in the post, especially as compared to email.

Mail sent to a public figure by their fans.

Any mail or letters that are not welcome or solicited and typically sent in bulk; especially mail of a commercial nature such as advertising circulars and form letters.

The delivery point where Mail Services delivers and collects mail.

(computing) A software product that uses a file (or database) of names and addresses, together with a template document, to produce multiple copies of a letter, each personally addressed to a different recipient.

To carry out such a process.