Regarding Blocking access

[siva kumar]

Hi Friends,
 
 I am new to this group and new to linux
 We have one linux server which is public ip.
 All the mails going from our linux server are going to spam.
 somebody is logging remotely and using my linux server for smtp purpose.
 how can i block the access.
 Please help me.
 
 Thanks in advance for your help.
 
 Regards,
 Siva Kumar
 
 
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