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In general, getting rid of spam is purely beneficial Even positive side effects exist, such as the fact that spam filters often catch email viruses (they re just a different type of spam) That said, there are a few things to watch for when installing spam filters: False positives: Spam filters that are too aggressive or too broad can prevent important messages from getting through It s better to let a few spam messages through than to over filter and inadvertently delete ham (desired email)
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Part V Preserving Privacy 167 Processing overhead: Any organization that has several users, or maintains a mail server that handles large volumes of mail, may find that spam filters tax their mail 14 server In general, email is not a performance intensive application, so it is common Preserving for mail servers to operate on older, slower hardware With spam in the picture, mail Privacy: Spam servers can quickly run low on processing power or drive space Management One solution is to separate the mail server functionality onto different physical servers The existing server can be used to only handle incoming and outgoing mail Mail delivery systems (such as POP and IMAP) and spam/virus filtering functionality can be handled on a separate, more powerful machine
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Internet Services (email): Understanding how email works is necessary to better understand why spam happens and how to protect your network against being a spam relay Firewalls: These enable less secure internal servers that spammers can t reach Your external mail server can be configured to only talk to the proxy, eliminating its effectiveness as a relay Viruses and Trojans: Virus emails are a special type of malicious spam A good virus Trojan horse detection system will help eliminate this ugly monstrosity
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A number of effective techniques minimize spam besides the use of spam filters Most of these techniques can be used alongside spam filters, or can provide some protection in situations where filters can t be applied Make sure your own primary mail servers have not been blacklisted The major blacklist services have a tool for determining if a mail server has been blacklisted It is a good practice to do this periodically, even if there is no reason for your server to be blacklisted A malicious person could create a situation that would result in an innocent mail server or email address being added to one or more of these blacklists Many ISPs use these blacklists to block server access to their networks Once a mail server is on a blacklist most of the mail it sends, whether actual spam or not, will be blocked All of these services do provide methods to get removed from a blacklist if a server was added in error It is a good idea to download and apply mail server patches Serious spammers will look for mail servers with known security flaws These are mail servers that they can really own With a large enough selection of insecure servers, spammers can effectively avoid getting blacklisted and send out as much spam as they desire
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168 Network Security Illustrated The following is a list of other quick tips to help in the war against spam: 1 As mentioned earlier, email addresses are harvested from web pages It is a good practice to never post real email addresses on a web page 2 If you do need to put your email address online, you can obfuscate the address by adding stuff that might confuse a harvester, such as M*dot*Johnson*removeifnotspam*at*example*dot*com 3 Be careful Harvesters are smart; they can match for typical obfuscation patterns such as meatexampledotcom, or menospam@examplecom Get creative 4 Always keep a garbage email address for situations that require providing an address to a non-business or family contact Businesses might want to issue a number of addresses to each employee: one for internal, one for family/friends, one for vendors, and one for customers Garbage addresses are also useful for filling out forms on the Web This way, spam collects at an email address that is not important
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