By 2005/2006, the number of open mail relays had shrunk from several hundred thousand to a negligible fraction.Īlthough the situation is no longer as critical as it was then, according to the non-profit organization Spamhaus, spammers are still finding 10 to 20 new open servers in the network per day. Various countermeasures have been deployed to solve the problem of open mail relays – first SMTP-After-POP and then ESMTP and ASMTP in 1995. Furthermore, the constant change of fake addresses made it possible to avoid spam filters. By using external hardware, the spammers also saved their own resources and so could not be traced back. Since the servers did not have additional authentication mechanisms at the time, they accepted the spam mails without difficulty and fed them into the network. The term given to this practice is “mail spoofing”. Morally questionable advertisers and malicious criminals (above all, the notorious “spam king” Sanford Wallace with his Cyberpromo firm) used the open servers with stolen or invented e-mail addresses to distribute spam. However, the widespread use of such unprotected relays led to the proliferation of spam. What seems absurd in today’s environment was originally founded in good reason: system errors and server failures were more frequent, so open mail relays could maintain regular traffic even in emergency situations. mail servers that forward all e-mails regardless of the sender or recipient address. For this reason, open mail relays were the norm until about 1997, i.e. The need for this procedure is due to the inherent features of the original 1982 SMTP, which did not provide user authentication by default. Cracking process will automatically save the results to a file, to prevent accidental shutdown or forget to save results.SMTP AUTH prevents an SMTP server from being misused as an open mail relay and distributes spam within a network. Once it cracked a smtp successfully, it can immediately send a message to the specified mailbox using the smtp just cracked to to test the smtp available or not, if it is not available, it will be directly discarded to ensure that the smtp in result list can certainly be used to send mail.ħ. + Top-level domain (if email is the server can be ‘’ ‘’ and ‘).ĥ.Perfect support for multi-threaded working so that can crack very fast.Ħ. Automatically obtain the part before and the full address as username, for example the cracking email is then the username can be ‘abc’ and Automatically according to the e-mail address to get the mailbox’s SMTP server to support the top-level domain for three ways smtp. as variable (the software will auto generate the the pass string depend on the currently cracking mail).ģ. Set some commonly weak passwords, the password support #user#, #domain# etc. Import an e-mail address list which includes as many as possible(you can get the e-mail addresses by other e-mail collector).Ģ.

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