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CSCatchAll by Christensen Software

CSCatchAll adds a much-needed feature to MS Exchange Server 2000 and 2003: A catch-all mailbox that receives all mail originally addressed to recipients that are not in your active directory. There is zero configuration of CSCatchAll necessary - just install it and add a "catchall@yourdomain.com" email address to any of your users in the active directory. That user then receives all misaddressed email.

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Mail Storage Guard by MAPILab Ltd.

Mail Storage Guard is an extension for Microsoft Exchange 2000/2003 and IIS SMTP servers, designed to protect your mail server from spam, prevents mail relaying, mail bomb and NDR attacks. Support extended blacklists with wildcards; public DNS blacklists (ORDB, SPEWS, SPAMCOP and others); can reject all "misaddressed" mail (recipient not listed in Active Directory) at SMTP level or point its to postmaster; and many other features.

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