From the doc: 'This Emailbomber can send mails directly to the target MX Server,So no need of a SMTP server for bombing,It will work on all Windows platforms.Very fast,It can send mails with coustom headers like,From ID,From Name, X-mailer, Organistation,Originating Server,Date.We can select priority and Content Type.We can Send Attachments too.It can automaticaly create random Subject,random messages.The Size is also very small.Stop searching for the open SMTP servers and use this!!.'
Flooder Program [Panda]Flooder.MailSpam.Hirs.25 [Kaspersky]
hirsemailbomber.exe