EnvelopeFeederInstalled Property
True if the current printer has a special feeder for envelopes. Read-only Boolean.
Example
This example prints the active document as an envelope, provided that there's an envelope feeder installed.
If Options.EnvelopeFeederInstalled = True Then
ActiveDocument.Envelope.PrintOut _
AddressFromLeft:=InchesToPoints(3), _
AddressFromTop:=InchesToPoints(1.5)
Else
Msgbox "No envelope feeder available."
End If