I use a mac with Mail to manage mail connected to the NethMail server. From some senders who send me an email with an attachment, I happen to receive a Winmail.dat attachment instead of the correct attachment.
I noticed it only happens on MACs.
Is there any way to fix it?
Winmail.dat is an old, at least 25 year old problem and still exists.
It is NOT a problem with any Mac or any Mailserver, but actually the problem of the sender. These often seem to be older Outlook (Office) versions.
You can read up on the Winmail.dat problem (eg search Google), it’s been around for at least 25 years now! And it’s always Outlook (Usually older version) doing wrong encapsulation for an attachment. Once entered into Outlooks profile / Addressbook, even if you use Outlook on a different PC (under Windows!) you’ll still get a Winmail.dat file…
The sender should configure better Outlook/Exchange. Several software are available to “unpack” the message/attachment contained into the Winmail.dat file. I never look for any for Mac OS but… I’d try a run into the web for some more info.
That’s how you upgrade MS Products, they’re commercial, after all.
→ If it’s someone outside your organization, it’s anyway out of your control…