If your site account was opened after 10/17/2017. Greylisting has been disabled by default.
If you are unhappy with the delays in delivery caused by greylisting, if your web application is not performing properly due to greylisting, or you are having difficulties testing your mail account settings in Outlook because of greylisting, it may be advisable to disable it.
Greylisting must be disabled on a per user basis, and you must be logged in as the Primary Domain Administrator to do so ("firstname.lastname@example.org" by default).
Trouble logging in? Simply enter your email address OR username in order to reset your password.
For faster and more reliable delivery, add email@example.com to your trusted senders list in your email software.