If I mention the domain www.masterclass-adfaerdsdesign.com in the body of an email to my office365 email (on a different domain), the email never arrives in the inbox or the junk email folder.
Any email where I mention other domains etc arrive (sent from the same email account as the other emails).
I get no error message.
Microsoft's SMTP server happily accepts the email when my SMTP server delivers it. After that the email is just gone.
www.masterclass-adfaerdsdesign.com is not used for mailing, neither from or to. It is only mentioned in the body of the email.
How do I debug this?
How can I reach a person at Microsoft to debug this?