Permit mail
Encyclopedia
Permit mail is anything sent through the postal service where postage is paid by a post office issued permit. No postage stamp
Postage stamp
A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

 is affixed to letters sent by permit mail.

The post office will bill the sender based on the number of items sent, their weight, etc.

Advantages of permit mail:
  1. The sender does not have to affix postage stamps to the mail
  2. The sender does not have to safeguard postage stamps from employee theft
  3. The post office
    Post office
    A post office is a facility forming part of a postal system for the posting, receipt, sorting, handling, transmission or delivery of mail.Post offices offer mail-related services such as post office boxes, postage and packaging supplies...

    does not have to cancel any stamps, thus requiring less work to deliver the mail.
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