Combine the features and formatting of HTML e-mail with the safety of plain-text messages by designating specific senders as safe. Dennis O'Reilly began writing about workplace technology as an ...

For instance, if you set the program to send HTML email, you can press "Shift" before clicking "Reply," "Reply to All" or "Write." Thunderbird will send your message as plain text.

The HTML format is not supported by all email clients. Microsoft Outlook 2007 supports both plain text messages and HTML emails that contain links, formatting and graphics.

4] Allow Mail through the firewall. The Mail app will start showing your emails in HTML format if your security program interferes with it. To confirm this, we recommend you allow the Mail app ...