A user, probably using Outlook on a PC is sending a message to two users on Macs, running the same version of Mac OSX and the same version of the Apple mail client Mail.app. One of the Mac users receives the message as intended with formatted text and attachments showing up normally. The other Mac user receives the message and can see only the body text of the message and any attachments or other formatted text in the messages shows up as a single 'winmail.dat' attachment.
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The two Mac users have combed through every available setting in Mail>Preferences as well as the settable view options in the app but can not find any discrepancy that accounts for this, nor any way to resolve the issue. One user can read the incoming message normally, the other user is essentially out of luck.
The user who's having the problem has an iCloud mail account BTW, so (at least one would hope) the difference can not be explained by something that her ISP is doing to 'corrupt' incoming mail.
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Searching for help on this issue, I find tons of content that talks about how the PC user can change settings to mitigate the problem. In this case, however, the same message can be read by one Mac user but not another, so I'm really hoping to find a fix for this on the Mac side by asking in Apple support communities.
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Posted on Sep 1, 2019 8:55 AM