Prior to deploying email signatures, they can be previewed.
Click Signatures, select signature and then click Preview.
The email signature is opened in the preview mode with the custom user information extracted from the Active Directory for the currently logged on user.
To preview the email signature for a different user, in the Preview as field, enter account's initials for which you want the signature to be previewed.
A list of most recently previewed users appears.
To preview different email formats, click the HTML signature, Rich Text signature, or Plain text signature tabs.
To preview the signature together with a disclaimer or a campaign, select them from the respective drop-down lists.
Note: The campaign drop-down list only appears if the campaign module is licensed.
Whats how it's done in v7.5 (old version, but you get the idea):