You can print postage on regular paper if you are mailing packages. A package is a box or padded mailer at least 3/4 inches thick. Most of the included layouts (printing layouts) print to paper.
If you are mailing large First-Class flat envelopes (8 × 10 or 9 × 12 inches), you should use Avery 5164 labels, which include 6 labels per 8.5 × 11 inch sheet.
If you are mailing First-Class letters using business size (#10, #9, #6) envelopes, you should print directly on the envelope.
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