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An email spam filter software can save you for many aggravating hours of waste of time per month and make sure that your needed emails go thru and not go to the spam filter box.
Spam filters have been known for many years and they all have advantages and dis-advantages depending upon if you are a private person or an enterprise. Spam email filter either let thru too much spam or or put too much good email in the spam box instead.
Anti spam filters sometimes depends upon certain keywords or senders IP address and/or email - and sometimes even on the message itself as a whole. Therefore, many spammers make up messages that are unique by using text spin software or they mis-spell certain words deliberately so those words don't raise a flag in the spam software. Mail spam cost companies and ISP's millions of dollar sin bandwidth cost and lost hours looking thru spam.
it would be nice to open up your email every day spam free but that is virtually impossible. Some spam blocker systems use "response challenge" for any new sender of email by entering a captcha code first time to be "white listed" so the email comes thru. But, the problem with that is that if the sender's email is not monitored at all like a "noreply@somedomain.com" - then the sender will never get to know that the is such an an email where they have to click on a link and then enter a captcha code - or...the email from the receiver goes to the senders spam box by mistake.
So, all in all it is not an easy to get good spam protection for exchange spam servers. A spamfilter is sometimes referred to as a junk filter or junk mail filter. Especially for a business then they want no spam at all since it waste their workers time every day. Anti spam software comes in many types and price classes and offers varying degree of mail filter facilities for different systems like anti spam exchange servers and some are even free anti spam services for non-commercial businesses.
Internet spam is a big problem for anyone who uses email because we all get spam emails daily. A good spam control appliance equals a good junk mail filter that is effectice as a anti spam junk email.
Before deciding upon a spam blocker then you must find decide if you need a server spam filter or if any spam blockers will do as a spam solution to prevent spam. Some decide on a spam gateway or mail server spam filter.
If you need anti spam service guard is used for spam removal and some are even freeware email spam filtering such as Microsoft.
Spam filtering software that works for exchange server spam filter are needed for large enterprises who needs good email spam protection to bounce and stop unwanted spam emails. Baleysian spam filter works by inputting words that are often used in spam emails but the problem is that there are many ways for the spammer to circumvent this by misspelling the words or even draw the words using a lot of signs and that way bypass the effort to eliminate spam or reduce it. Online spam filters can be good depending upon your situation or your needs but in such case then many of these basically pass thru their servers before reaching you and if you have sensitive information then this may not fit your needs for security.
Free spam blockers and free antispam services are usually aimed at private persons and can not be used for companies who have large amount of emails going in and out or who have special needs. SMTP, IMAP and pop3 spam filters must fit your needs the best before you decide on any business spam filter services or software.