Hi @harikrishnadevanabowina ,
Error Address configuration will be used to handle bounce mail and enter the configured email address of messages with errors. If any technical issues occur due to handle bounce mail(while sending the bounce emails if any technical issues occur, then the message will go from this error address configured email), including emails received by the Adobe Campaign server due to non-existent target addresses (if the email Address is empty and the error message comes to Adobe Server then it default comes from this error email configuration).
PFA the documentation link for the same.
https://experienceleague.adobe.com/docs/campaign-classic/using/installing-campaign-classic/initial-configuration/deploying-an-instance.html?lang=en#managing-bounced-emails
Regards,
Pravallika.