Showing Email Headers in Webmail
- Log into Horde Webmail.
- Open the email message.
Click the arrow located to the left of the subject in the lower box to expand options.
Click "Other Options" then "View Source"
- Log into Roundcube Webmail.
- Double-click to open the email message.
- On the right side of the open message will be a small arrow, click it to expand the full headers.