from the doc: ' Since my first mailbomber had quite good success, I decided to improve it, and so.. MailBomber 1.2 is here! In this version I improved the sending routine. Now the soft send out only one email, and the SMTP server make all the copies you want! So now sending 1000 mail will take a only bit more that sending 1 email! I also add the attachment feature.. you can attach to all the email some files (useless of course) to make them bigger and so slower to download. Simply run the exe included to bomb all the mail boxes you want!'
mailbomber.exe