It is MANDATORY that all Departments mailing 1st Class with 500 or more pieces use 1st Class Bulk Mail.
 
1st Class Bulk Mail Procedures are as follows:

• Must be 500 or more pieces
• Need the Permit #6 indicia in the upper right hand corner or be metered by the Mail Room
• Must be in Zip Code Order
• Must be exact in weight and content, unless they are metered by the Mail Room
• NO INTERNATIONAL MAIL IN FIRST CLASS BULK

After the above requirements have been met, the department must mark the mailing with the Function Number that is to be charged.