Every time a user runs the Sign.exe file, a license is being used.
When no more licenses are available, email signatures are no longer updated.
Users can still the last generated email signatures.
View license information
Open the admin console and click the home button in the quick access bar.
Request and copy a new license key
Email email@example.com and request and new license key.
Open the admin console > Configuration, Key and copy/paste your license key and the security code provided by eMailSignature or a reseller.