### Question
How is the term mass mailing defined?


### Answer
The term **mass mailing** is defined in *2 U.S.C. § 431* as the following:

> a mailing by United States mail or facsimile of more than 500 pieces of mail matter of an identical or substantially similar nature within any 30-day period

#### Citation:
  - *2 U.S.C. § 431*
  - Heading: **CHAPTER 14-FEDERAL ELECTION CAMPAIGNS > SUBCHAPTER I-DISCLOSURE OF FEDERAL CAMPAIGN FUNDS**

