[exim] Possible to Customize Error Messages

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Autor: .|MoNK|Cucumber .
Data:  
Para: exim-users
Assunto: [exim] Possible to Customize Error Messages
Is it possible to customize Exim error messages?

Specifically when you send a mail to an invalid recipient, it says:

"Message rejected by SMTP server. Check message content and attachments
Server Responded: valid RCPT command must precede DATA"

I would like to change it to something more friendly such as "Invalid TO
address specified".