I just registered my own domain (flyingvivaldi.com) with a mail account and tested by sending emails to this account from 3 domains. However, only emails from one of the domains (kamicat.com) get through. Emails sent from the other 2 domains (arcor.de and stevemann.net) never arrive. I know that emails from these 2 domains get through to other recipients, so the problem is not with the sending domains.

Do you have any idea why this may be the case?

Best regards,

Steve