Letter Opener banner

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When Letter Opener converts a winmail.dat attachment, a the Letter Opener banner appears on top of the email message.

If you don’t want to see the banner you can change your Letter Opener settings.


Simply go to Mail > Letter Opener for macOS Mail and untick “Show Letter Opener Banner”


If your banner shows something other than the conversion message click the following link:

Winmail.dat does not open