Gmail's Postini is a program that offers you superior anti spam protection, ensuring that spam messages and threats are immediately blocked before they are able to enter your email inbox.
Your Postini options are:
1) Postini Basic Anti-spam – this blocks spam from reaching your email.
2) Postini Anti-spam with Message Security – this program goes further, offering you total message security
3) Postini Mail Archiving - this program also provides a secure archive for your email where you can easily search for messages.
Postini was developed to make your email server more secure. Email threats are blocked in real time, which frees up resources and protects bandwidth – spam messages are literally blocked before they reach your email inbox – you will not see them. If your company is serious about message security, Postini Message Security and Mail Archiving is for you.
Postini requires no hardware or software to install and maintain – greatly reducing your costs.