Why Your Email Competition Is A Problem
If you want people to visit your website to enter the competition then don't give out an email address for entries! This is a sure fire way to attract spam, lose entries and end up in a bit of a mess. Our advice is set up a web based form and perhaps include a CAPTCHA element as well.
Email entry competitions are the easiest to copy & paste. This means ...
1. You will get entries from people who have perhaps not even visited your site. Your competition will probably be cut/pasted to forums and you'll be losing out on traffic!
2. You are also much more exposed to Automated Entry Services, spam, and multiple entries.
3. You also have no means of tracking where your entries are coming from or who's entering.
With a form based entry system, users must visit your website. You can track referrals, monitor traffic and IP addresses and with CAPTCHA stop automated or bot entries. You can also use your competition to promote your site to the visitor.
Email entry route competitions are not good for your business, attract cheats and are hard work. They should be avoided at all costs.
An Alternative Option
If you insist on using email as a competition mechanic then you could always follow the method used by Coronation Street Blog. They tag the line "Please note that entries will not be accepted from Loquax, moneysavingsexpert.com and all other competition entry websites".
This is genius!
The siteowner is able to distinguish between compers and non-compers and not only that they also know that people who like the programme don't enter competitions via comping sites. Yes we are being sarcastic but it demonstrates a point that email is not a sensible option if you wanting to limit entries!