No e-mail input possible (Error code 1460)

[Psychcore]

Good day
I have the following problem. On my scale email addresses I can not receive any more messages. I get the error code 1460

The Seerver's (Windows) a V-Server with Strato

 

[IgorG]

Have you tried troubleshoot it with mailserver logs at least? Any results, details, error messages, etc?