Know the model and brand of the machine that will automatically process the envelopes.

Choose the correct envelope size for the particular machine.

There should be no variation in size or shape as it could risk causing jams in the machine.

Envelope paper is specific. Make sure the quality of the paper is to the correct standard.

Automatic:The glue that is used is moistened by water from the enveloping maching.
Normal Use: Active glue with protective tape should be used (to prevent the envelopes from sticking together inside the boxes and to facilitate the closing of the envelopes without the need to use normal glue).

Normally made of acetate (plastic) – must ensure enough transparency to allow the automatic or human reading of the address during the mail processing and distribution process by postal operators.

Envelopes should be correctly stored and ready for use at any time. The area where they are stored should be dry and well ventilated.