How to add email address and domain name in trusted list in Zimbra:
1. Login to the webmail, as shown on the figure below.
Webmail URL: http://webmail.example.com
2. Click on the "Preference" tab and click on the "Trusted addresses" link from the left hand side menu bar.
3. Now add the email address (example: firstname.lastname@example.org) or domain name (example: abc.com) under the text box shown above and click on "Add".
4. Now click on button to save settings.
N.B: After adding the mail addresses and domain name in trusted list, mails from the particular email address goes to Inbox folder.