Why am I getting winmail.dat errors in my mail client?
Posted by Andrew Weisz on 13 July 2012 04:42 PM
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Summary: winmail.dat is a proprietary Microsoft method of encrypting mail. This file is generally only understood by Microsoft programs. Non-Microsoft mail clients often can not read the winmail.dat attachment. This is a very common problem. This situation occurs when an Outlook mail client is configured to send mail using the rich text format rather than HTML. The sending mail client (Outlook) needs to be configured to use HTML markup. NOTE: This is a change that needs to be made on the sender, so it will likely be a person outside of the local organization. In general you can disable this behavior in Outlook as follows:
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