The growth of internet technology has been increasing drastically. Due to that the security threat also increasing day by day in the form of spam. Electronic mail is comfortable medium for sharing our personal as well as business information. Email users receiving lots of unwanted mail everyday from anonymous users. Spam mails occupy much storage and time to tackle by the email users. Even though various robust spam filters exists, Spammers find a new way to spread the messages and to promote business as well as spreading malware. We are in need of rigid filter to prevent from spam mails. The objective of this paper is to study on existing problems related with spam mail and spam filtering Techniques for tackle the spam problem.