There are several ways in which one can create and quickly use a disposable email address.
Plus addressing
Plus addressing is where you append a plus (+) to your email username and add other characters of your choice. If for example your email address is example@gmail.com, you can use example+MadeUpName@gmail.com and it will work.
Aliases
Hotmail offers this for free and Yahoo! Mail charges for it with a Plus subscription. This is where you have another completely separate email address alias to the primary account. The advantage of an alias over plus addressing is that your primary email address username isn’t displayed.
Forwarding addresses using your own domain
If you have your own dot-com/net/org, even the cheapest web host provider allows you to create infinite forwarding addresses from your domain (ex: make-up-a-name@your-domain.site) to your primary email address. Granted, it’s not free, but it works great.
Enter 33mail
Over the years there have been more than a few email alias services that have come and go, but one that stands out more than the rest is 33mail.
Compared to other ways of using email aliases, 33mail has advanced features that are genuinely useful, but before I get into that, how 33mail works is like this:
1. Create a 33mail account and pick a username.
2. Any time you want to use an alias, make one up on the spot. If your username is example, you could use capnkirk@example.33mail.com, mrspock@example.33mail.com, scotty@example.33mail.com and so on. You get the idea. The only thing that has to remain the same each time is what happens after the @.
3. There is no step 3. That’s it.
What makes 33mail different however is what you can do with your aliases aside from just receiving messages from them. In the 33mail "Manage Aliases" panel, you have the ability to block or unblock certain aliases, check to see which are the most used out of the aliases you use (very handy if you use many), and the bandwidth used per each alias. These are features not seen in any other email alias service.
Is there any downside?
Only one. There is a limit to how much email bandwidth can be used per month. If you receive a lot of emails to your aliases that contain file attachments, you’ll use up the monthly bandwidth quickly. But if you only receive emails where the bulk of them are just text, you won’t have to worry about it.
If you do run into a bandwidth limit on 33mail’s servers, there is a Premium Account option which costs $12 a year. Considering Yahoo! Mail charges $19.99 a year to get the same feature, and Hotmail only allows for 5 aliases a year, 33mail’s price is a fair deal for what it is.
Is 33mail reliable?
I have no idea as I just recently found out about the service. My suggestion is that if you think 33mail is a good idea, test the service for a week or so to see if mail does deliver properly for you. From my small tests it appeared to work without issue, but I have no long-term data using the 33mail service.
You can check out 33mail at www.33mail.com.

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Another good site for this purpose is Mailinator (www.mailinator.com), which allows you to choose between several domain names.
Sam
Tel Aviv
Israel
Mailinator addresses only last a while though, 33mail addresses are permanent unless you block them.
Hi, I’m one of the creators of 33mail. To your question about reliability, our operating costs are very low, and we’re both addicted users of 33mail, so we’d happily pay to keep it running just for our own needs!