Here are the places where you can find the email address of your link prospect:

• Contact Us Page. Look at the different sides of the homepage (top, bottom, sidebars) to find a link pointing to the contact us page.
• Contact Form. Find the email ad at the top of the contact form (somewhere in the description/paragraph above it).
• Employee Bio Page. For prominent brands, there might be a bio page for each of the brand's staff member or employee. If you can't find your prospect's bio page, search for his personal blog/site (it may have been stated in the bio page, then find his email address in his own website).
• Google search. Use this query: site:domain.com @gmail.com OR [at] [dot] to see his email address in the search results.
• Linsy.me with Rapportive. Type in the name and/or the site of your link prospect in Linsy.me and place each and/or all of the email addresses in your email message (see the image below). Make sure you install Rapportive in your Gmail account to ensure that he is the right person you're looking for.

I also recommend using Buzzstream or Citation Labs Contact Finder for easy identification of email addresses