Lexmark MX710
Use envelopes that have been stored in a dry environment.
Note: Printing on envelopes with high moisture content can seal the flaps.
Resend the print job.
Does the envelope seal when printing?
Contact customer support.
The problem is solved.
Incorrect Color Representation when Printing from Adobe Acrobat Version 9.0
Corner fold issue when printing duplex using A4 paper