Sunday, March 14, 2004 8:36 PM bart

Attachment blocking in Exchange

Exchange 2003 does not provide a built-in method to block certain attachments in mailmessages. However it's possible to set up such blocks in OWA using the registry (more info on http://support.microsoft.com/default.aspx?scid=kb;en-us;555001 and http://support.microsoft.com/default.aspx?scid=kb;en-us;823486). Although this is a nice way to block attachments, it's not the best thing to use if a lot of users are working with POP3 or IMAP4 access to the server. In that case, attachments can be blocked in the mailclient itself but in my opinion there should be a better way to do it. Fortunately, there's a thing called "SMTP Event Sinks" that can be used to develop your own plug-ins in the SMTP server software in Windows Server. Thanks to interop it's possible to get rid of the C++-way of working to write such an add-on. For more info see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsmtps/html/writingmngsinks.asp?frame=true#writingmngsinks_topic2 which is a great article on this topic. Let's dive into this stuff tonight :-)Del.icio.us | Digg It | Technorati | Blinklist | Furl | reddit | DotNetKicks

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