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Kindly assist me to resolve the error: Recipient address rejected: User unknown in virtual mailbox table, so that it gives me a bounce back message for local recipients users when they do not exist in virtual mailbox. I have observed that the SMTP rejects e-mail for non-existing users and the compose window remains active without sending the e-mails to even a single user in the list. This is caused by typos mistakes on the address bar when composing messages.