Winmail.dat issues with btinternet.com

[scusack]

So this is one that I cannot find a fix anywhere. Two client companies (different people each time) sent emails with attachments that always arrive as winmail.dat on Outlook 365 (latest update on Windows 11), also on the BT Mail website, but OK on my iPhone's email.  None of the suggestions already online work, so please don't suggest trying a fix that I've already tried half a dozen times over the last 2 years.

Why does it only happen with BTinternet.com? I have 4 other email addresses (not BT) and the attachments work OK with them, using the same copy of Outlook 365.

[gg30340]

My and I am sure other forum member crystal balls are not working so perhaps you could enlighten us what fixes you have tried so that we don't try to "suggest trying a fix that I've already tried half a dozen times over the last 2 years".

[Jane2018]

I sometimes have the same problem on my other email address too and in those cases (very few people send me .dat files) I just forward them to my hotmail email (yet another email I have) which can open them without any problems.

[scusack]

Here is a selection of websites that I've referred to. However if any other website mentions winmail.dat please be assured there's a very strong possibility I've already read it and tried it's suggestions over the last 2 years.  It only happens with these two clients (major corporations) and only with the BTinternet.com (and btopenworld equivalent) email address.

https://www.lifewire.com/prevent-sending-winmail-dat-attachments-1173717

https://www.secureax.com/blog/fix-winmaildat-attachment/ 

https://answers.microsoft.com/en-us/outlook_com/forum/all/why-i-am-getting-email-attachments-as-winm... 

https://answers.microsoft.com/en-us/outlook_com/forum/all/why-i-am-getting-email-attachments-as-winm... 

https://discussions.apple.com/thread/252764097?sortBy=best 

[scusack]

Once it's received as a winmail.dat file, forwarding them on to an alternative address simply forwards the winmail file, it doesn't unpack it.

[gg30340]

For test purposes are you able to take your Outlook 365 out of the equation in order to see what format the extensions arrive at your BTMail webmail account as?

[scusack]

OK I shut down Outlook.  Then I arranged for an email with an attachment to be sent to me.  I opened my BT webmail on Chrome, and the attachment was there as a winmail.dat file. Nothing to do with my Outlook.

[gg30340]

Ok. I doubt there is anything that the forum users will be able to do to resolve this so I have notified the moderators of the forum about your problem. Once they have read this they may be able to help or pass the problem onto the BTMail email team.  They will advise you by posting on this thread.

[DavidM]

Hi @scusack and thanks for posting.

This is a bit of a mystery and I'm not sure there's anything we can do to help but we'll be happy to try. Check your inbox for my message and drop me over the details.

Cheers

David

[rbz5416]

The mention of clients suggests this is, or should be, a business email account?