Always send plain text of emails to a particular contact in Outlook 2010
To always send only plain text of emails to a certain contact in Microsoft Outlook 2010, you can configure settings of this contact as following:
Step 1: Shift to the Contacts view, and open the contact with double clicking it.
Step 2: In the opening Contact window, move mouse over the email address in the E-mail box, click the More button > Outlook Properties in the Contact card in Outlook 2010. See screen shot below:
Step 3: In the opening E-mail Properties dialog box, click the Internet format box and select the Send Plain Text only from the drop down list, and click the OK button.
Step 4: Click the Save & Close button in the Contact window.
From now on, no matter which format emails the certain contact are in, the contact can only receive emails in the Plain Text format.
Notes:
(1) You can’t configure the Internet format option of exchange users’ email addresses.