M — An abbreviation for a thousand, as in sheets of paper or names on a mailing list.

Magnetic storage — Any magnetic medium such as a disk or tape used to store digital information.

Magnetic tape — A plastic-based material with a coating of magnetic particles.

Mail — The primary vehicle of a direct response advertising campaign, often combined with space ads, telemarketing and online efforts.

Mail date — The target date for a mailing to deliver to the post office, from which mailers backtrack to determine other production dates, such as printing and copy and art approval.

Mail monitoring — Seeding mailing lists with addresses of the mailers, in order to judge how long pieces take to reach the recipients and to flag the mailer to unauthorized use of the list.

Mail order — A mail-generated sale of a product or service.

Mail piece — All the components of a mailing. Also called mail package.

Mail preference service — A program provided by the Direct Marketing Association that allows consumers to request that their address be removed from all DMA mailing lists.

Mail response — Any sort of reply to a mailing. Mail responses are not always accompanied by payment. They could be individuals who answer a questionnaire or send any other reply. A mailer is given ownership of all responses to a mailing. See Lead generation and No's.

Mail server — A computer that processes incoming and outgoing e-mail for a network.

Mailer — The organization who arranges and pays for a mailing.

Mailing list — The names and addresses of individuals, businesses or other institutions that have common characteristics making them suitable targets for specific promotions.

Mailstop — An internal delivery number used by large companies and government agencies, without which much business-to-business mail would not get delivered.

Market — A set of potential buyers for a product.
Market penetration — The ratio of the potential buyers reached by a mailing to the total number of potential buyers in an area.

Masterfile — The total house list of an organization, which is split into numerous segments for in-house mailing or rental to outside mailers.

Media — All the means available to market to people. This spans broadcast media such as online computer ads, radio or TV and includes printed forms of advertising such as direct mail or magazine ads.

Median demographic data — U.S. Census data that is reported by median, that is the mid-point between the highest and lowest in a set of numbers.

Medium — Singular for media.

Member — Those who belong to an organization or association, or who subscribe to a club-like service.

Merge — To combine two or more lists into a single list and sort them together, generally by ZIP code.

Merge-purge — To combine lists and delete any duplicate records.

Minimum — A price for low list quantities on lists that are usually sold per thousand names.

M.O.B. — Abbreviation for mail order buyer

Mobility rate — The rate of changes of address for any given geographic location, measured as a percentage of the population.

M/P — Abbreviation for merge-purge.

Multibuyers — Identical records that appear on two or more customer lists, identified through a merge-purge.

Multifamily — See Multiple dwelling.

Multiple buyers — Customers who have purchased from one company more than once, usually a select offered on a mailing list.

Multiple dwelling — A housing unit that requires an apartment number because of the number of families that live at one address.

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