Hi.
The ussl module was replaced by the ssl module in MicroPython.

Please use this version of the uMail library instead: https://raw.githubusercontent.com/RuiSantosdotme/Random-Nerd-Tutorials/master/Projects/ESP-MicroPython/umail.py

I’ll fix the link in the eBook soon.

Let me know if this fixes the issue.

Regards,

Sara