I've noticed a lot of people look for email bombing programs. I wont say anymore than found any luck with that ? If you get this method dialled though it only takes 5 to 10 minutes to do yourself. It's a simple php script. A do while loop that sends anything up to 50,000 emails.
We'll start from the beginning. Into your browsers URL type : www.000webhost.com. This will take you a free web hosting website. The reason I pick this webhosting site is because it's relatively easy to set up a dummy account.
Click on the tab "ORDER NOW" as seen below :

You'll now see a new page open were it asks for personal details. My advice here is give all fake ones. Here's an example :

Now you've filled out the form with your ficticious details, click on "Create My Account". You should see something like the following :

This is your web domain being built. I usually find it takes up to 5 mins max, so go stick the kettle on if you want.
Once your domain has been built, enter your control panel by clicking on :

In the new page that opens up click on "File Manager" :

Click on "public html directory" as show below :

This is the stage were we now create our php loop. Click on "New File" :

The php code for bombing is :




Click on the back arrow to go back to your root directory. To execute our index.php script, simply type the URL of your web domain into the address bar i.e.

Hit Enter and your php bombing loop will do it's thing. The length of time before your account get shuts down varies. Although the good thing about this method I've showed you is that it's quick to just open up another account.
While your bombing script is running it should look like this :

Once your account has been shutdown you'll see a blank page. I hope this has been helpful for whatever purposes. Although I genuinely can't see a legitimate purpose you'd have for doing this lol. Here's the results of my index.php script :
