MailTo Email Campaign Setup

I want to create a MailTo email campaign that will generate a link for followers to click on and send an email to designated people. The link will pull up a pre-drafted email message for them in their mail app, then all they will have to do is hit the send button. I have figured out how to generate such a link, but I don't know how to make it so I can share the link on social media or hyperlink it into emails / PDFs, etc. The main thing I need to be able to do is share the MailTo link in social media posts. I don't know if I'm going to have to create a website or otherwise to have something solid to embed the MailTo link into or not. I've been using onlinewebtoolkit to try to figure this out but am missing something. Need a reliable professional to assist with this as it is for a huge campaign. We will need to test the link for reliability multiple times before we publish and launch the real campaign. This is a time-sensitive project and I'm hoping to figure this out by tomorrow (Monday 9/6)