Is your email landing in the spam folder instead of the inbox? It usually comes...

https://www.scribd.com/document/1015795200/What-is-Microsoft-SNDS-and-What-Does-It-Tell-Me-178837

Is your email landing in the spam folder instead of the inbox? It usually comes down to your domain reputation. If you don't keep your spam complaint rate under 0.1%, mailbox providers will automatically filter your messages