Long story short, here's a juice of what i understand from this thread:
Email domain marketing for dummies, Vol.1

- Study the right field that fits your domain, and focus the market sector you're looking to deal with.
- Get a list of possible end users looking for:
a) People who advertise on overture (view advertisers->max bids) or adsense (sponsored links) on that keyword(s).
b) Google search for similar websites
c) Owners of similar domains but worst in quality then your.
Take the e-mail adresses from the whois of the respective site-owners.
- Set up the email account of the domain you're willing to sell, something like info@domaintosell.com or yourrealnamesurname@domaintosell.com or postmaster@domaintosell.com
- Set up a private auction on eBay with a complete description of the domain name and, eventually, a reserve price. I'd suggest to keep up the auction for not more then 7 days.
- Write a short, polite and well written email, personalized for each possible customer, where you mark him the existence of this domain on auction, and the time it will be end to induce a bit of pressure and let the potential buyer to check the auction immediatly, rather then let him wait few days and forget it.
Don't mention the value of the domain, he will check it when he will met the reserve price in the auction.
End the email with your real Name, your domainer website (if you have one) adress and your telephone number.
Write the DN is on sale in the subject line, something like "Domain DomainToSell.com is being auctioned". There's no reason to hide the email behind an eye-catching subject. If the buyer is interested it will open it for sure.
- Wait for the bids to come with lot of patience.


I wish this could help..