How do I whitelist or approve a sender with Postini?
If you have an email account with Postini spam and virus filtering, you can whitelist friendly senders whose multiple-recipient messages may be identified as spam. Examples of this would be if you are on an informal “CC:” mailing list used by friends or business associates. If you do whitelist a sender, you must be extra vigilant to avoid clicking on links which may lead to malicious websites.