We would advise against giving out contact information on your blog. If you want someone to contact you via your blog, you can turn on the link to the 'contact owner' page which allows people to contact you via your blog, but without them knowing your email address.
Your blog also has an "About me" section which you can fill in with as much or as little detail as you like. Again, we would suggest that you think carefully about how much contact information you publish there, but your "About me" page is more flexible, because you can control who sees it. So if you want to publish your email address but only to people at Warwick, you can put it on your "About me" page and then set that page to be accessible only by staff and students at Warwick.