The best way to mitigate risk is to remove it entirely: keep dangerous phishing emails (and annoying spam) out of your and your employees’ inboxes.
Phishing and other threats rely on email as the primary attack method. Anti-spam keeps all the spam and suspicious emails out of your inbox. You can even adjust how tightly Antispam controls the flow of emails to your inbox.
See also: Business Antivirus
Anti-spam