My Plesk email account is set to forward to another domain. #

This redirection works fine, i.e. the mail is received on the external account.

However, after sending a test, I received the delivery failure email below. How is this possible, because the email is received?

The message you sent to domain.com/crdm was rejected because it would exceed the quota for the mailbox.

The subject of the message follows: 

Subject: subject

This is because the forwarding account is set to also keep a local copy of the emails. To resolve this ensure that your email account is not forwarding and storing a copy as well.

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