SpamShield Pro Approved & Blocked Senders List Limit
The maximum number of Approved Senders and Blocked Senders depends on whether you have SpamShield Pro or SpamShield Lite.
When you reach the limit, the SpamShield Options page will display an error message such as:
New addresses cannot be added to your list because the limit of 500 has been reached. To add new addresses, please delete enough existing addresses so that the limit is not exceeded.
The SpamShield Pro Actions menu will display an error message such as:
firstname.lastname@example.org cannot be added to Blocked Sender List because of quota limit
Other SpamShield Pro Actions menu actions, such as moving a message to the Trash folder, will still be performed on the message.
Tip: Web Mail Email Rules can be used to approve and block senders based on advanced criteria, such as filtering out by domains or subject lines of messages.