This TOP line is your email Subject. Change it to suit your needs.
Hi,

Thanks for trading links :-)  

I have upgraded your website's listing <URL> to Link Partner Status. Find it here <ThemeSitePageURL> in the <theme> theme. 

Regards,
<myname>
<myemailaddress>
<mywebsiteurl>

Info to add my website's link to your website:
<linkpageinfo>

A link you might be interested in to increase your website's traffic:
<distributorid>

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(The message above has been left purposely vague as you must re-write it in your own personal style. Do not include all the MailMerge tags if you want your message to look unique.)

(Do not include the Title and Description section. You want them to visit your Link Directory and if you give them the Title and Description, they won't. I have included the <title> and <description> just in case someone wants to use them for something.)

TITLE: <title>
DESCRIPTION: <description>