I start with an E end with an E and have a letter in me

I start with an E end with an E and have a letter in me

I start with an E end with an E and have a letter in me

Solve me this

I start with an E end with an E and have a letter in me and have

I start with an E, end with an E, and have a letter in me. What am I?

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ANSWER

An ENVELOPE.