Postage created thru Orange Mailer may be printed on any printer you have available. However, we recommend using a Zebra or other label printer for ease of use and reliability.
Labels are preset at 4" x 6". Use this as a guideline and any printer should work.
If you need to print directly onto envelopes (using first class postage), a standard laser or ink jet printer should work fine. Simply insert an envelope into the printer as indicated in the printers manual (usually centered in the paper tray), and the postage will print directly onto the envelope.
There is no need to fear mis-printing as all postage purchase may be re-printed at any time (don't try to re-use postage though, as that could be a Federal Offense.)