[Dovecot] Blocked

I have blocked some pop3 user sessions:

Dec 8 00:03:38 xxxxxx pop3-login: Disconnected: user=<johndoe>

Is there a way of sending a message to a user that constantly tries to establish a block pop3 session?

Example:

From: noreply@mysite.com Subject: Your POP3 session Message:

Hello, Your POP3 session is blocked; please contact systemmanagement

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