Sometimes the Microsoft spam filters can block our email getting though to you. What you need to do is add our email address (firstname.lastname@example.org) to your Safe Senders List. These exact directions change from time to time, but they should get you there.
How add an Email to your safe senders list in Outlook
Click on “Settings”, then “View all Outlook settings”.
Go to “Junk email”, then choose “Safe senders and domains” or “Safe mailing lists” to select the domain or email you want to whitelist.
Enter the domain name or email address you wish to add to Safe senders.
How add an Email to your safe senders list in Hotmail?
Click on "Options" in the upper right corner of your Hotmail screen. Then click the link for "Safe and Blocked Senders" in the body of the page under Junk e-mail. Click the "Safe Senders" link and enter the email address you want to whitelist.