Stumbled upon a service that you want to sign up to but prefer not to sign up with your own email address? You could use a disposable email address for that purpose if you don't plan to add personal information to the new account.
For example, if you just want to sign up to access information, you can do so using an unrelated email account. This would not work however if you wanted to sign up on a site like Facebook for example, as you would reveal information about yourself on the site after all.
One option that you have is to use a proxy email address service which provides you with temporary email addresses for exactly that purpose.
A proxy email address sits between a service or recipient and the real email address. The benefit of this is that the service or recipient do not receive information about the real email address of the user as they communicate only with the temporary address.
Tempalias makes it very easy to create a proxy email address. You needs to enter the real email address emails are forwarded to from the proxy email and specify the days or number of received messages the email should be valid for.
Tempalias will automatically generate a random - but never used before - email address for users that can then be used until the time or mail count runs out.
It has to be noted that the email address will never be accessible again once it runs out. That's different from most disposable email services where email addresses are always accessible by all users unless a specific system is in place that locks used email addresses to accounts.
The developers are currently working on a bookmarklet to make it even easier to use the proxy email address service.
Update: Tempalias is down for now. It has been offline since 2011 and it is unlikely that it will ever come back. I suggest you use a service like Yopmail instead which gives you a temporary email address directly without having to reveal your email address in first place.
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