Create the signature first in Outlook, then just leave the HTML one as is. But you can open the.txt ones with Notepad and the.rtf ones with Word and edit them. This will enable you to have three different signatures for the three different email formats. In Outlook 2003, or Outlook 2002, click Plain Text, and then click HTML or Rich Text. Existing posts In Outlook 2007, click Other Actions after you open the post item on the Discussion tab in the Actions group.

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Outlook For Mac All Plain Text Editor
Outlook For Mac All Plain Text Passwords

There are three message formats to choose from in Outlook: Plain text, HTML, and Rich Text Format. You don't have to designate your favorite format every time you compose a message. Make it your default message format in Outlook instead and apply it automatically to every message.

Instructions in this article apply to Outlook 2019, Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Office 365.

How to Set the Default Message Format in Outlook

HTML is the default message format in Outlook. While plain text format works for all email programs, it doesn’t support text formatting. Rich Text Format (RTF) is only supported by Microsoft Exchange Client versions 4.0 and 5.0 and Outlook.

To configure the default format for new emails in Outlook:

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Outlook For Mac All Plain Text Editor

Go to File > Options.
In the Outlook Options dialog box, select Mail.
Select the Compose messages in this format drop-down arrow and choose the format you want to use as the default for new emails.

Outlook For Mac All Plain Text Passwords

You can set up Outlook to always use plain text or rich text for individual recipients regardless of the default message format you specify.