Disabling highlighting of objects in Zimbra web UI
Zimbra has a couple of Zimlets (plugins) that highlight parts of messages when viewed in the Zimbra Web Console such as dates, phone numbers and e-mails and turn them into special contextual links. Whilst this functionality is often quite useful, sometimes you just need to see the raw, unadulterated e-mail without your client interfering with the content – particularly if you are testing e-mail designs!
You can either disable Zimlets server wide through the admin console, or on a per-account basis using the preferences. In particular, look for the “Date”, “Email”, “Phone” and “URL Links” Zimlets as these are the four of the default Zimlets in Zimbra 7.x that are responsible for highlighting parts of messages and turning them into contextual links.