Hello {recipient},

I have been using {sitename} for their free online collaboration services
 to better communicate and share information with my colleagues.

I thought you might like to try it out. 

<mask>

To become a free member of {sitename}, click the link below.
If it is not an active link, copy and paste the URL in a browser.

{joinlink}

Let me know if you join?

Regards,
{sendername}