Just write a post, designated as "General Comments". Setup a link to the comment form under the post, and make the post a static page in the blog.
See the right most entry in my menu bar above?
<a href="http://blogging.nitecruzr.net/2005/06/leave-comments-here.html#comment-form">Contact Me</a>
Now, enable either comment moderation (which you should use, anyway), or comment notification (if you're daring enough to not moderate), and provide your email address in the setting. Your email address absolutely won't be visible, anywhere, to the public. And you'll be contactable through comments, that you can publish or not, as you (or the reader) wish.
If you disable anonymous comments, and require Google accounts to comment, you'll even pick up the email addresses associated with the Google accounts of your commenters.
Note that if you are using inline comments ("Embedded below post"), and / or CAPTCHA ("word verification") screening in the blog, you should advise your readers to enable third party cookies, if they wish to be able to comment on your blog.