Not sure if this applies to your situation, but I had the same issue. The winmail.dat files were Access database files that were trying to come through from an AOL account. I had them export and send as Excel files instead to resolve the issue. -----Original Message----- From: Chris Wall [mailto:Chris.Wall@xxxxxxxxxxxxxxxxxxx] Sent: Friday, September 05, 2003 10:45 AM To: [ExchangeList] Subject: [exchangelist] Attachment blocking http://www.MSExchange.org/ Hello all, Running Exchange 5.5 I am running GFI Mail Security and have all .dat files blocked. I am experiencing an issue where valid e-mails from other organizations are being blocked due to winmail.dat files being attached to their messages. It is not realistic for me to send them directions to turn off TNEF to prevent the winmail.dat attachment. Do most of you block .dat files? If so, how do you overcome this issue in your organization? I can not whitelist a specific attachment through GFI so I am stuck. Any ideas appreciated. Thanks, Chris Wall ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=exchangelist Exchange Newsletters: http://www.msexchange.org/pages/newsletter.asp Exchange FAQ: http://www.msexchange.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Other Internet Software Marketing Sites: Leading Network Software Directory: http://www.serverfiles.com No.1 ISA Server Resource Site: http://www.isaserver.org Windows Security Resource Site: http://www.windowsecurity.com/ Network Security Library: http://www.secinf.net/ Windows 2000/NT Fax Solutions: http://www.ntfaxfaq.com ------------------------------------------------------ You are currently subscribed to this MSExchange.org Discussion List as: deea@xxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ##################################################################################### Only the individual sender is responsible for the content of the message, and the message does not necessarily reflect the position or policy of the Texas State Teachers Association or its affiliates.