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You know , there're some mail servers that they just accept send mail to the users of theirs . So how can I know the user list of theirs ?
Thanks 4 help ;)
I mean that :
I telnet to mail.xxx.com 25 , and send a mail to my friends :p . But there're some mail servers just accept to send mail to users of theirs . So how can I know the mail list of their server .
