> is there any solution to solve spam problem > > > generated by mail server > > > the mail server in sendmail > > > > > you didn't google, did you? sorry, your question is quite incomprehensible. there are enough methods to fight spam, but it depends where: is your own mailserver sending spam? are you receveing spam? if your server sends spam, you should read some documentation about relaying with sendmail and some mechanisms to secure it: http://www.sendmail.org/tips/relaying.php (of course, there is more, google is your friend...) also, you could use spamassassin in conjunction with your mailserver to check incoming messages. Spamassassin is in Core packages and installable via yum. HTH Roger