New mail server and empty mail content - winmail.dat

Csaba

11/20/22, 3:43 PM

I have two IMAP accounts in Outlook 365. If I send an e-mail from my 1st account to 2nd account the e-mail is received I can see the subject but the message body is missing. Instead I can see that there is an attachment but can't view it either. If I open the given e-mail in other client e.g. Rainloop (web interface) I can see the e-mail content and even the attachment - winmail.dat.

I know that Outlook can send the e-mail in RTF format in which case it uses this winmail.dat file. Some e-mail clients have problem to view it, however I'm surprised that Outlook has problem to view its own e-mail sent by itself .

What is interesting that this issue happens only with this 2nd account - e-mail server on Ubuntu (postfix, dovecot, ViMbAdmin). So apparently the server is somehow changes the e-mail so Outlook can't read it. I'm the admin of this server but I'm not an expert.

I was not able to find any article which helps with this - most of them are about disabling the RTF format of Outlook and use HTML/Plain text.

UPDATE:

I noticed that Outlook has problem only with e-mails formatted as HTML, the Rich formatted e-mails are displayed. Further I checked the plain/original version of the e-mail on the server. What is interesting that HTML version does not contain any winmail.dat attachment (the Rich version contains). However if I view the e-mail via Rainloop (even via Outlook) it displays a winmail.dat attachment - smaller than the Rich version of e-mail (~half size).

So it looks like that dovecot or its subsystem (or something else?) converts/sends the e-mail to client with winmail.dat...

Any help is appreciated. Thanks!

1 + 2

postfix

dovecot

steeldriver

11/20/22, 7:33 PM

Something similar was posted [here](https://serverfault.com/questions/700611/emails-corrupt-and-a-winmail-dat-file-attachment-added-for-only-one-mail-box) several years ago and the only suggestion was to check for a `.procmailrc` file associated with the particular mailbox

Csaba

11/21/22, 6:38 AM

I did not find such file either :-(

Score:1

Ubuntu

Csaba

11/22/22, 3:07 PM

Well, this was an Outlook issue. If I selected the To address from the auto-complete list, Outlook messed up the e-mail and could not render...

0 + 0

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: New mail server and empty mail content - winmail.dat

TH: เซิร์ฟเวอร์เมลใหม่และเนื้อหาเมลเปล่า - winmail.dat

RO: Server de e-mail nou și conținut de e-mail gol - winmail.dat

RU: Новый почтовый сервер и пустое содержимое почты - winmail.dat

VI: Máy chủ thư mới và nội dung thư trống - winmail.dat

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