This is the DNS from my laptop (Notice the manual redaction):
$ host XX.training
XX.training has address X.X.X.X
XX.training mail is handled by 10 XX.training.
XX.training mail is handled by 0 XX-training.mail.protection.outlook.com.
Don't know whether outlook.com protection is too protective. In that case Moodle is not the culprit.
$ host XX.training
XX.training has address X.X.X.X
XX.training mail is handled by 10 XX.training.
XX.training mail is handled by 0 XX-training.mail.protection.outlook.com.
Don't know whether outlook.com protection is too protective. In that case Moodle is not the culprit.