SECTION ONE - USPS Requirements

1. Minimum Quantity - Bulk mail must contain a minimum of 200 pieces with identical contents.
2. Identical Pieces - All pieces must be identical. in weight and size. Paper weight and envelope or other mailer must be uniform throughout the mailing.
3. USA Only - Bulk mail is limited to delivery within the USA and USA Possessions. Bulk mail can not be sent outside the U.S.A.
4. Consistent Addressing - All addresses must face the same direction and be legibly typed, printed or hand written.
5. Meet Non-Profit Requirements - Requirements for mailing at the non-profit bulk rate are stringent and are established by the U. S. Postal Service. The Mail Center can assist you with this determination. ALL MAILINGS MUST HAVE A COMPLETE RETURN ADDRESS, INCLUDING "UNIVERSITY OF COLORADO at Denver and HEALTH SCIENCES CENTER", IN ORDER TO QUALIFY FOR THE NON-PROFIT BULK RATE.
6. Sorted by Zip Code - All mail must be sorted by zip code. Individual bundles must have at least ten pieces and may not be more than 4" in thickness. If the items are thick, there may be as few as seven or eight pieces per bundle. Books or other printed matter may be bundled in packets of five. Prepare a bundle that is easy to handle and manage. Contact the Mail Center at 315-7810, 315-7827, or 315-7826 if you have any questions.
7. Banding of bundles - Rubber band each bundle separately, length first, then width. If the bundles are small, and this kind of banding makes them bunch up, use smaller rubber bands and put one around each end.
8. Identifying Stickers - Identify each bundle with the appropriate colored self-stick label. Affix the label on the top piece of each bundle in the lower left-hand corner.
   DO NOT PLACE STICKERS ON EACH PIECE IN THE BUNDLE.
   The stickers are identified as follows:
   • Red, D: -- bundle containing pieces with the same five-digit zip code.
   • Green, 3 -- bundle containing pieces with the same first three digits of the zip code.
   • Pink, S -- bundle containing pieces belonging to the same state.
   • Brown, Area -- bundle containing pieces for several different states.
9. USPS Acceptance - Bulk mailings must be entered into the system at a designated U. S. Postal facility and must be accompanied by Postal Service Form #3602. An employee of the Mail Center will take the mailing to a postal facility. Other arrangements for delivery to the Postal Service must be made in advance and in consultation with the Mail Center Manager.

Bulk Mail Links

http://www.usps.com/send/postagepermitimprintsandmeters/tipsforusingapermit

Or try this link

http://www.usps.com/businessmail101/