Hello jczapko,
If you have tried all the steps to resolve the envelope jams and are still having issues, you would need to place a service call: 1-800-821-2797
2 month old 6515 with updated drivers. Trying to print envelopes and it jams every time (with different envelopes - ie brand new and older ones). Yes, I put the envelopes in the right way (actually any way i put them in it jams). Help and Thank you