If you're editing your email templates using the HTML editor on your site, you may want to change the editor settings to prevent the designer from over aggressively modifying your HTML code.
- Login as the superuser and go to the Host > HTML Editor Manager page.
- Select Everyone and uncheck the RemoveScripts and MakeURLsAbsolute settings under Content Filters.
- Also, select the Enable Relative URL Links checkbox to allow it.
- Repeat for Users and Host if you have multiple configurations.