To: "{firstname} {lastname}" <{email}>
From: "Your Name" <you@example.com>
MIME-Version: 1.0
Content-type: text/plain; charset={txt_charset}
Subject: {firstname}, please confirm your email address

Hello {firstname},

Thanks for subscribing to our newsletter. Please open the link below in your browser in order to confirm your email address.

<{confirmation_link}>

Yours sincerely

XYZ Inc.