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How to Guarantee Mail Sending always Successful ? 
- Please click "Settings->Diagnose sending" to locate the problems.
- Please click "Settings->Diagnose RBL" to check if your server IP address has been listed in RBLs.
If you need our help to solve sending problems, please forward us failure notices you have got and diagnose report after diagnose sending.
You are suggested to add several ISP relay accounts. >>What is ISP relay sending and how to configure?.
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