Transactional email from Wordpress site goes directly to Junk Email folder.

Hello!
Im using a « Starter Plan » on Brevo mainly as my mailer in a Wordpress website.

When i use the send test email of WP Mail SMTP i receive all email notifications correctly (to gmail.com and other custom domains) but when i send test email to a hotmail.com, outlook.com, msn.com they go directly the « JUNK EMAIL » folder.

This is very important for our business because those notifications are mostly Order confirmations and stuff that is really important for us to be delivery correctly to all email addresses.

Can you help on this?