Labels; Envelopes - Epson EPL-6100 Reference Manual

Labels

You can load up to 10 sheets of labels into the MP tray. However,
you may need to feed some types of labels one sheet at a time.
To prevent the adhesive from coming into contact with printer
parts, always use labels that completely cover the backing sheet
such that no gaps occur between the individual labels.
You should test the label sheet for leaking adhesive by pressing a
sheet of paper on top of a sheet of labels. If the paper sticks to the
label sheet when you lift it off, do not use the labels.

Envelopes

You can load up to 10 envelopes into the MP tray, depending on
the envelope thickness (85 to 105 g/m²). Load envelopes with the
flap side down and short edge first.
To print on envelopes, choose Thick Narrow (Windows) or
Thick[N] (Macintosh) from the Paper Type drop-down list in the
Basic settings menu (Windows) or Basic Settings dialog box
(Macintosh).
Paper Handling
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