Epson Stylus Color 3000 User Manual page 58

Printing on Special Media
9. Load the stack with the printable side face down and slide
it all the way into the feeder. Gently press the stack against
the right edge guide.
If you are loading envelopes, place the envelopes face down
with the flap edge leading into the feeder. You can load a
maximum of 10 envelopes.
3-10