If you're still seeing winmail.dat attachments: Under the 'Mail Format' tab, click on the button labeled 'Internet Format.' in the 'Message format' sectionĬhange 'When sending Outlook Rich Text messages to Internet recipients, use this format:' to 'Convert to HTML format' Still in the Mail Options window, scroll to the bottom, and under 'Message format,' make sure 'When sending messages in Rich Text format to Internet recipients:' is set to 'Convert to HTML format.' This will ensure that any outgoing mail is converted if it's sent to a non-Outlook user like Trello.Ĭlick on the Tools menu, and then click on 'Options' It's possible to send messages in Outlook RTF if that's been pre-configured, so you'll need to change one more setting. This is usually referred to as Outlook RTF.įollow the steps below to change your configuration: If you're using Outlook 2010, 2013, or 2016:Ĭlick on the File menu, and then click on 'Options'Ĭlick on 'Mail' in the left column, and under 'Compose messages,' make sure 'Compose messages in this format:' is set to 'HTML'Ĭhanging this setting will ensure that new messages are sent as HTML by default. Outlook can be configured to use a proprietary encoding method that isn't typically understood by non-Outlook mail clients. If you are attaching a file when creating a new Trello card from email and that attachment is showing up in Trello as a 'winmail.dat' file instead of the attached file, you'll need to make some adjustments to Outlook's settings.

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