Whether or not we agree? Do we agree?

[Tom]

Hi

At the end of a "suggestion letter", what I should write?

1- Whether or not do we agree?
2- Whether or not we agree?

Or are they same?

Tom

[Yankee]

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I wouldn't write either one, Tom. Neither one is a sentence and trying to use them as sentences sounds awful.
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You could make a complete sentence this way, for example:
I'd like to know whether we agree.

Or you could write:

Please let me know whether you/we agree.

You don't need to add "or not" because that is already understood.

Amy