HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 77)

76 3 Common Printing Tasks EN
To print envelopes from tray 1
1 Select envelope in your application or in the printer driver if your
application does not support printing on envelopes. For more
information on printing on envelopes, see the online help.
2 Set the envelope size and type in your application or the printer
driver.
3 If your application does not have an option to automatically format
an envelope, select Landscape for the page orientation.
4 Use the following table to set the margins for a return and mailing
address on a Commercial #10- (Com10) or DL-sized envelope.
For other sizes of envelopes, adjust the margins as necessary.
Avoid printing over the area where the envelope's three back
flaps (seams) meet.
5 Print the file from your application.
Type of Address Left Margin Top Margin
Return 0.50 in (12.70 mm) 0.50 in (12.70 mm)
Mailing 4 in (101.60 mm) 2 in (50.80 mm)