Definition
100

A postal service that provides the most secure possible delivery for First Class or priority mail 

Registered mail 

200

A postal service that restricts delivery only to addressee or an authorized representative of the addressee

Restricted delivery

300

Postal service for printed matter, flyers, circulars, advertising, newsletters, bulletins, catalogs, small parcels, and commercial mail.

Standard Mail 

400

A system in which files are filed alphabetically the subject matter involved, accounting, insurance, personnel

Subject filing 

500

A doctrine that protects evaluation, strategy, and planning of the attorney from discovery by opposing counsel during litigation.

work product doctrine

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