You are running Premium Antispam within Symantec Mail Security for Microsoft Exchange 7.5.1 or earlier and have noticed that rulesets are no longer being updated even though the product still has an active subscription.
Prior to August 2016 Symantec's delivery method for antispam rulesets utilized a SHA-1 certificate. Due to security concerns Symantec has deprecated the utilization of SHA-1 and is instead utilizing the much more secure SHA-2 certificates. Because of this change versions of Symantec Mail Security prior to 7.5.2 do not contain the necessary certificate required to communicate with the ruleset servers.
The recommended solution is to upgrade to Symantec Mail Security for Microsoft Exchange 7.5.2 or later.
Note: Prior to upgrade confirm SMSMSE upgrade path by operating system within the following article: https://support.symantec.com/en_US/article.TECH141889.html
Work-Around for versions prior to 7.5.2:
1. Download trusted.cert file from the attachments section of this article.
2. Stop the following Symantec Mail Security for Microsoft Exchange services:
3. Navigate to the Symantec Mail Security for Microsoft Exchange installation directory:
4. Back up the files trusted.cert and cert.pem then delete the originals.
5. Copy the downloaded file trusted.cert to the location:
6. Start the following Symantec Mail Security for Microsoft Exchange services:
7. Re-install the license from the Symantec Mail Security for Microsoft Exchange user interface (Admin -> Licensing)