In an email message? Nigh on impossible. What it customarily does is launch an email client which necessarily needs an address to send to.

You'd need to set up a website where replies could be typed into a box and the reply text would be delivered by the webhost to somewhere that you could read it. (I tend to be annoyed when presented with such a web form; I'd much prefer a real email address that I could write to using a regular email client, so I have a record of what I sent.)

If you're after a purely cosmetic solution, i.e. you're not fixated on keeping your email address secret, then you could insert a link.

Click <a href="mailto:email_address@example.com?subject=Some%20relevant%20text">HERE</a> to send an email.

…which would look like this:

Click HERE to send an email.

Note that in many browsers or email clients, when you hover over the visible text it'll show the embedded mailto link, i.e. (in this example) mailto:email_address@example.com?subject=Some%20relevant%20text

Note that in this forum, the html parser it uses recognizes mailto: as a valid protocol and so makes it into a link, which isn't quite the effect I wanted to demonstrate.