If you use Microsoft as your email address, follow these steps.
#1 Create Email White List Pages with Microsoft Host
You can create a special white list page whose content directs you as a safe email sender. How? You can ask them to follow these steps:
Step 1: Open a Microsoft email application.
Step 2: Click on the Settings menu > Mail > Junk Mail.
Step 3: In this section, ask your email recipients to add all your email addresses as safe email recipients (safe senders and domains).
Finish.
#2 Global White List
Apart from the method above, you can also ask your email recipients to white list your domain. Ask them to do the following steps:
Step 1: Go to the https://protection.office.com/antispam.
Step 2: In the spam filter, add your domain in the section Allow List > Allow domains.
Finish.