Political Campaigns: Red Tag 57
Political campaign mailings are identified and documented when presented at the main Phoenix Post Office acceptance unit prior to entry into processing and distribution. Using a red Tag 57, Political Campaign Mailing, aids in identification of of political campaign mailings.
First-Class Mail and Standard Mail entered entered by a registered political candidate, campaign committee or committee of a political party can be identified by using Tag 57 on the mailing containers. Use of Tag 57 with eligible campaign mailings is optional.
Mailings made by organizations other than those listed above, even if promoting or endorsing political candidates, referendums and so forth, are not classified as political campaign mailings and cannot use Tag 57.
Source: Phoenix Bulk Mail

