Applies to: I21X/I21Y/I21Q/I21YB/SP3(I31O)/SP5(I21AO)
Here are the steps for you:
If you use Gmail, please open https://myaccount.google.com/security?pli=1#connectedapps
and log in to your Gmail account to turn on the less secure app first.
Besides, please also enable IMAP in your Gmail account setting.
Then you could follow the instructions step by step to set the email alert.