The Lotus/IBM Notes can receive large attachments in their emails and they belong to different formats for images, documents, sheets, and videos. But, a dreaded attachment the belongs to RTF format shows it as ‘Winmail.dat’ and it does not show the correct format also. It is actually an encoded message has the plain text of the message and the binary attachment with winmail.dat format. It has the following information-
The winmail.dat does not open in the existing application that open the supposed attachments and there can be numerous reasons behind such problem.
This attachment issue basically arises when the Exchange Server sends a message without turning ON the MIME encoding and has adopted the proprietary of Rich Text Format (RTF). Lotus Notes application does not support messages in Rich Text Format in its older versions, although the latest one like Domino 8.5x supports the RTF format.
You can either try finding the solution through Domino Administrator or through changing RTF formatting in different versions of Exchange Server.
First, install the latest updates for Domino (versions 6.5.6, 7.0.3, 8.0.2, or 8.5.x).
Open your Domino Administrator. Navigate to SERVER > SERVER CONSOLE. Then run these commands one after another.
set config TNEFKeepAttachment=1
set config TNEFEnableConversion=1
tell router update config
Disable sending messages in RTF domain by running this command.
After executing the commands, you need to restart the Microsoft Exchange Transport Service to confirm the changes.
Mail senders can control the conversion options for TNEF messages sent to all recipients (both internal and external). The options available are:
All these RTF formatting settings would resolve the WinMail.dat attachment issues in non-Exchange based email clients like Lotus Notes. And if you find many restrictions or limitations in your current Lotus Notes email client, you can anytime migrate its data to any version of Exchange Server with Kernel for Lotus Notes to Outlook tool. The software has the simplest user-interface and performs automated migration in no time. Feel free to migrate anytime with secure software.
Quick and secure migration from Lotus Notes to Outlook