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If the greeting of a letter is called the Salutation what is the end of the letter called; example. Sincerely yours.

Thanks
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Hi,

You could call it a valediction, but it's a rather fancy word.

Clive
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Hi

It is sometimes called "signing off". This is a metaphor from radio, when the speaker gives their identity before they stop speaking

And I'll sign off now!..

With best regards, Dave