• DO NOT feed partly used label sheets. The exposed carrier sheet will damage your machine.
• Label sheets should not exceed the paper weight specifications. For more information about the paper weight specifications, please refer to the FAQ "What kind of paper can I use?" Labels exceeding this specification may not be fed or printed properly and may cause damage to your machine.
• DO NOT reuse or insert labels that have previously been used or are missing a few labels on the sheet.

• DO NOT use damaged, curled, wrinkled, irregularly shaped, extremely shiny or textured envelopes.
• DO NOT use envelopes with clasps, staples, snaps, tie strings, self-adhesive components, windows, holes, cutouts or perforations.
• DO NOT use envelopes that are of a baggy construction, not sharply creased, embossed (have raised writing on them) or pre-printed on the inside.
• DO NOT use envelopes that were previously printed by a laser printer.
• DO NOT use envelopes that cannot be arranged when stacked.
• DO NOT use envelopes that are made of paper that weighs more than the paper weight specifications for the printer.
• DO NOT use envelopes that are not straight or consistently square.
• DO NOT use envelopes with windows, holes, cut-outs or perforations
• DO NOT use envelopes with glue on surface as shown in figure below
  
  
  
  
• DO NOT use envelopes with double flaps as shown in figure below
  
  
  
  
• DO NOT use envelopes with sealing flaps that are not folded down when purchased
• DO NOT use envelopes with each side folded as shown in figure below
  
  

If you use any types of envelopes listed above, they may damage your printer. This damage is not covered under any Brother warranty or service agreement.