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Distribution Services
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Sealing Mail

  • All pre-stamped, outgoing, official mail should be sealed before being picked up by the Distribution Services staff.
  • Tabs are the preferred method to seal a letter mail piece that does not use an envelope. In lieu of tabs, wafer seals or tape may also be used. Clasps, staples, string, buttons, and similar protrusions may not be used as methods of closing letter size pieces since they can cause jams and damage to the mail during transport. For similar reasons, the edges may not be notched, scalloped, or curved. The sealed open edge must be the top of the mail piece.
  • When addressing manila clasp envelopes, the clasp should be located on the right hand side as you look at the face of the envelope. Manila envelopes should be sealed/clasped before being sent to the Mail Center.


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Distribution Services
California Polytechnic State University
San Luis Obispo, CA 93407
Phone (805) 756-2872
Fax (805) 756-2873
warehouse@calpoly.edu