A 523 error means that Cloudflare could not reach your host web server.

The most common cause is that your DNS settings are incorrect.

Please contact your hosting provider to confirm your origin IP and then make sure the correct IP is listed for your A record in your Cloudflare DNS Settings page.

The entire message is sent in a proprietary format to preserve Rich Text Formatting, according to Microsoft.

The simplest, but most annoying, is to ask the sender to resend the email in plain text format.

This will prevent the attachments from being bundled into the winmail.dat file.

There are numerous little apps, that let you open them by using it.

I use TNEFs ENOUGH (appstore) but there is also winmail.dat reader on the appstore.

And if you happen to use the thunderbird mail client, there used to be a plugin (LookOut) that handles the winmail.dat container.

And while it is a simple configuration change most Exchange admins dont see the need unless prodded from above.

I had no choice, as I needed the files to finish some time sensitive work from my home using my iMac.

Microsoft Exchange has its good points, but this is not a feature to recommend it.

FYI, the app I purchased was called Winmail.dat Viewer - Letter Opener 9, Winmail.dat Premium.

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Letter Opener For Mac Outlook 2016