You’re receiving a large number of non-delivery reports (NDR) for emails that you never sent. Your contacts are receiving emails which appear to have been sent from your domain name.
This issue can occur if your email address has been spoofed by an unknown third-party. It is a technique commonly used for spam email to hide the origin of an email message.”
Typically, the email will have it’s From, Return-path and Reply-To fields set to appear as if the email has come from your address, rather than the actual sender.
At Ecenica we deploy anti-spoofing measures exclusively to every email account hosted on a Ecenica web hosting service. This ensures spoofed emails are correctly marked as spam.