An instance occurs when you encounter issues like ATT email not working on Mac. To deal with these issues, make sure about the following things. Make sure the external mail server has a message. Also, enter the right information while configuring the external mail settings. In any case, you enter the wrong port number, mail server address, or anything else; then ATT cannot retrieve your external emails. Along with it, it is important to check if there is an issue in the external mail server or local network. These are the things that you need to take care of to deal with ATT email is not working on Mac devices.