I have an Oki laser printer. It's small, lightweight, and has the capability of easily printing envelopes.

I use ordinary #10 envelopes and the machine works flawlessly except ... the envelopes often come out nicely printed, but sealed. Apparently the fuser will seal the envelope, making it useless.

I wound up slipping a piece of paper between the flap and the body and it worked fine, but that's probably not practical for printing quantities.

I know there are people here who print a lot of envelopes, so I'm wondering if they have the same problem and how to they handle it? Is it possible my envelope stock is old and not suitable? Any suggestions?