Outlook is a little different.
Many popular email programs, including Outlook, Outlook Express, Eudora, and Netscape Mail, do not provide a convenient way for you to whitelist email senders.
You can do something about it though. This ensures you will get your email alerts now and in the future.
Contact the customer service department or the postmaster at the company that provides your email or Internet connection (ISP).
Explain to them that the service you subscribe to sends you email alerts. Ask them if they can whitelist our email addresses.