Relevant Products: Exclaimer Cloud - Signatures for Office 365
When a signature is appended by Exclaimer Cloud, in some scenarios the recipient receives the email in plain text format. As a result, the signature is also displayed in plain text format rather than HTML.
The issue occurs because the message format has been changed from HTML to plain text during delivery of the message and after it has been processed by Exclaimer Cloud.
This can happen for a number of reasons, but most commonly:
- If the Remote Domain configuration settings specified on the Microsoft Exchange server are incorrectly configured.
- If the TNEFEnabled property is set to True, emails sent to providers who do not support Transport Neutral Encapsulation Format (TNEF) (for example, Gmail) will be displayed in plain text. The email will also be displayed in plain text if the recipient's email client does not support TNEF.
To check and configure the Remote Domain configuration settings, you need to:
Install the Exchange Online PowerShell module
Connect to Exchange Online
Check Remote Domain Settings
Change Remote Domain Settings
To Install the Exchange Online PowerShell V2 module:
Open the Windows PowerShell and run this command as an Administrator:
Confirm that you want to install this PowerShell module.
To connect to Exchange Online:
- If you have Multi-Factor Authentication enabled, run this command:
In <UPN> enter your username.
- If you don't have Multi-Factor Authentication enabled, run this command:
When prompted, enter your password (and the Multi-Factor Authentication verification code if required).
To check Remote Domain Settings
To view the current Remote Domain configuration, run the following command:
If the ContentType property is specified as MimeText, this is likely to be the cause of the message format being converted.
The ContentType property should be configured as either MimeHtmlText or MimeHtml, where:
- MimeHtml enforces HTML format.
- MimeHtmlText allows the receiving email client to decide the best format to display the message.
To change Remote Domain settings
To change the ContentType property, run the following command:
To set the TNEFEnabled property
If this is set to the default value, $Null (blank), then the TNEF messages are not specifically allowed or prevented for recipients in the destination domain. Whether the TNEF messages are sent to recipients in the remote domain depends on the specific setting on the mail contact or mail user or the setting specified by the sender in Outlook.
- Run the following command: