During Printing - Epson Stylus Photo 1290 User Manual

Note:
Return the adjust lever to the "0" position, which is the normal
position, after you finish printing on envelopes. Leaving the
lever in the "+" position may cause gaps to appear in images
printed on other media.
When the adjust lever is in the "+" position, make sure the High
Speed setting in the printer driver's Advanced dialog box is off.
To turn this option off, you may also need to change the Print
Quality setting.
Load envelopes flap edge first with the flap side down, as
shown in the illustration.
Do not use envelopes that are curled or folded.
Flatten envelopes before loading.
Avoid using envelopes that are too thin as they may curl

during printing.

Select Plain Paper as the Media Type setting in the printer
software.
Available envelopes sizes are:
No.10, DL, C6, 132 mm × 220 mm
Paper Handling
1-7