MS Exchange and Outlook have limited capabilities to block spam. Most of the mechanisms available to them are relatively...
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unsophisticated and prone to false positives. It is assumed that you will integrate third-party anti-spam products into any Exchange-based solutions such as Mailsweeper or GFI Mailessentials.
In the case of Linux-based clients most have similar anti-spam features to MS Outlook and are of limited effectiveness. The sole exception being Mozilla Thunderbird which has some slightly more powerful features in it -- though these require some configuration and are still subject to some false positives.
In the case of Linux-based e-mail servers most of these, with some configuration changes, have a number of built-in anti-spam features. This is particularly true of Postfix which provides a large number of variables that can reduce the volume of spam you receive. This generally though does not mitigate the need for a third-party add-on to prevent spam such as SpamAssassin or Bogofilter.
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