How To Resolve WordPress Unable to Send Messages/Mails from Contact Form? (There was an error trying to send your message).

Just recently, I received a complaint for a WordPress website I helped built, that it was no longer sending messages from the website's contact form. The owner of the website incidentally was curious why messages had stopped coming to them, and they did test it out and confirmed there was an error displayed on the WordPress website when trying to send a message using the WordPress Contact Form. So, I also tested and confirmed the error, which says:

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