Option A: Don't do this on the last page, but add another page before that one.
An than just simply use a question Send Email to a Personal Contact.
Option B: Another option is to use a mailto-URL that contains some content:
<a href="mailto:?body=Click here to do this cool survey:%0D%0Ahttps://www.soscisuvey.de/EXAMPLE/">Click here</a>
This, however, will not work if the respondent uses a webmailer such as Gmail.