i have a problem with the email server in which has been categorised as a spreading spam. my email server doesn't have any antivirus software. the dns has been blocked by a spam database site,
1) can anybody tell me the suitable antivirus program with the estimate budget and where can i get it?
2) i was furious some of the spam database side always mention bout the rDNS but our internet service provider also can't find a solution to this situation
3) can everybody tell me the suitable hardware and software firewall for blocking the unwanted internet site.