In the past, when spam mail was in its infancy, simply setting up certain keyword rules on your users' email client would usually do the trick to block unsolicited mail - or you just wouldn't bother since a few sporadic messages never caused too much trouble. However, now that over 75% of Internet email consists of spam, a more complete and realistic solution is required. In this case Network administrators are faced with two options; a 'Client-Based Solution' or a 'Server Based Solution'.
For this case I saw there are many free utilities we can use against this spam. So I assume to post them here and upgrade this post when I got new information about spam.
RSFF (Remove Spam For Free)Open Relay TestOnline test of your mail server
DNS/WHOISOnline lookup of DNS records and WHOIS
Email ValidateOnline test of email account validation
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