We're having a curious case where emails from CiviCRM as not always delivering.
CiviMail works fine. No issues there.
When sending a simple email from the actions on a contact record, Hotmail and Gmail accounts aren't receiving the email, despite CiviCRM displaying the message that is was successfully sent.
However, when emails are sent to my work MS Exchange account, where the IP address is whitelisted, they do arrive.
We've reviewed the mail settings, and when we do a spam test, we score 10/10 on mail-tester.com and are also not on any blacklists.
Has anyone else experienced this type of issue?
Where can I check to ensure CiviCRM is sending out the emails?