You can set the delivery format to plain text (rather than the default HTML):
- Click Contacts in the main navigation menu.
- Access an individual contact via the Search bar. You can type in a full or partial name or email address in the Search box, or use an Advanced Search for more complex queries.
- Click the down arrow next to the contact, and select Edit.
- Go to the Other Details tab, and under "Email format" select plain text.
- Click Update and Close when you have finished making changes.