I’ve been running my Mailcow server for several months. Multiple domains have been set up on the Mailcow.
Each domain has been configured to use an SMTP relay. Previously, when an email was sent from one internal domain to another, the relay was bypassed, and the recipient received the email without any issues.
However, now when an internal email is sent, it’s both delivered locally and through the SMTP relay. As a result, the recipient receives the same email twice.
Has anyone else experienced this issue or found a solution?
Thank you in advance.