Lotus/IBM Notes allows users to receive emails with large attachments, which can encompass various file formats, including images, documents, spreadsheets, and videos. However, a commonly encountered issue involves attachments in the RTF (Rich Text Format), which are often displayed as 'Winmail.dat' and fail to show their correct format. In reality, these attachments are encoded messages containing both the plain text of the message and binary attachments in the 'winmail.dat' format. They typically contain the following information:
Opening a 'winmail.dat' file in the existing application meant to handle the supposed attachments can be problematic, and there are several potential reasons for this issue.
The attachment issue typically arises when the Exchange Server sends a message without enabling MIME encoding and opts for the proprietary Rich Text Format (RTF). It's worth noting that older versions of the Lotus Notes application do not support messages in the Rich Text Format. However, more recent versions, such as Domino 8.5x, have added support for RTF format.
You have two potential avenues for resolving this issue: you can either seek a solution through the Domino Administrator or explore options to modify the RTF formatting in various versions of the 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.
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:
By adjusting the RTF formatting settings, you can effectively address the WinMail.dat attachment issues in non-Exchange based email clients like Lotus Notes. If you encounter restrictions or limitations within your current Lotus Notes email client, consider migrating your data to any version of Exchange Server using the Kernel for Lotus Notes to Outlook tool. This software boasts a user-friendly interface and offers automated migration, ensuring a seamless transition. Feel confident in your ability to migrate your data securely and efficiently whenever the need arises.
Quick and secure migration from Lotus Notes to Outlook