printf '%q ' "$_at_" alternative?

From: Max Ivanov <ivanov.maxim_at_gmail.com>
Date: Fri, 20 May 2016 15:13:57 +0100

Hi All,

How could I correctly save $_at_ in a file for a future execution?
Received on Fri May 20 2016 - 14:13:57 UTC

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