Send mail with Qutlook Express is returned

After using Qutlook Express to send an e-mail message, the message was found to be returned.

There are many reasons for this situation, mainly in the following situations.

1. Send the recipient address of the mail to fill in the error. In other words, when sending a message, the recipient's address is a non-existent e-mail address that is returned by the mail server. In this case, you can just fill in the correct recipient address.

2. The recipient's mailbox is full. If the recipient's e-mail does not have extra space to receive new mail, the message sent to him will be automatically returned. In this case, you can only use other methods to notify the recipient to clean up the mailbox and then resend it.

3. The e-mail address sent is set to reject by the recipient. In this case, you will not be able to use this email address to send a message to the recipient unless it is canceled.