Linode guys contacted me that my server was being used to carry out ssh brute force attacks. I saw that somebody had created a user named test on my Linode. I t

Linode guys contacted me that my server was being used to carry out ssh brute force attacks. I saw that somebody had created a user named test on my Linode. I think it might be related to postfix or dovecot. After I stopped those services so far there have been no problems. The other services I have running are Apache, Tomcat and ssh.