The main reason behind most SBCGlobal email errors is that the server settings you are entered are incorrect. You can refer to the steps below to reconfigure your account and fix the sending and receiving problem on SBCGlobal:
If you find that the error persists even after you reconfigure your account you can call the SBCGlobal Tech Support Number and ask for additional assistance.Read more: SBCGlobal Customer Service Number | SBCGlobal Technical Support Number