You set auto-forward and not save in local disk. If it does not work,please ask sender provide the bounce letter to Coremail customer service to find out problems. You can ask sender to save mail as compression file to send again. If you ensure that the mail is not a spam or a virus mail. You can ask sender to provide the bounce letter to Coremail customer service to find out problems. The sender entered incorrect mail address.If you can receive mails from other sites but mails from certain station, it is possible that the mail server of this site failed. The failure of other party's mail server.Please try to use command telnet to check SMTP port (Port 25) of your mail system in outside network. The failure of network or block firewall.You can refer to related books and seach the pages about this. You can contact domain service of mail system to ask them to assist to set DNS and MX record. MX must point to server address of mail system. The domain of mail system must have been registered, and domains and this exchanging record of this domain (MX records) must have DNS resolution. Your SMTP port(Port 25) reject external connection.The external mail server can not connect to your server. You do not have address of public network.(The system report for failure:553 You are not authorized to send mail, authentication is required) In Anti-spam management, you can set "Allow" of "Whether you allow authorization user is different from the sender" after you click "Advanced settings-Global settings-Advanced settings". In Outlook, if the user do not fill the field of sender with the right user's address, he/she can not send mail.If the end of recipients' address adds an extra space, the recipient can not receive mails but the system reminds the mail has been sent and the email doesn't bounce.(The system ignore space in English but regard it as a part of address in Chinese.).(The message for failure report is Internal Server Error.) The users send spams and the system accumulates many mails, which causes the inodes of disk are full.If you do not have the problems above, please contact Coremail customer service. If you use Outlook and Foxmail to send mails, please check server address, username and password of these email clients and ensure you have selected "My server need verification." The settings of client software is incorrect.This reason is easy to be ignored, and please check the recipient's Email address and try to select other recepients to find out the problems. Please use command telnet to check whether the SMTP port (Port 25) of external mail server is normal. It happens because of the failure of other party's mail system.Please use command ping in mail server to check whether the connection with external machine is normal. It happens because of the failure of network and firewall.Please check whether the settings of DNS server and the server are valid. The wrong DNS settings cause the failure of sending mail.
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