Outlook has a Junk Email Filter that identifies messages that might be spam and moves them to the Junk folder. The Junk Email Filter evaluates each incoming message based on several factors. Junk email is also subject to the settings of the recipient client.
You can add an email address or domain name to your safe senders list. Email addresses and domains on the safe senders list are not considered spam, regardless of the content of the message.
Home>Junk E-mail Options...>Safe Senders>Add.
Hope this helps!
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