I tried to configure zoho to get the email that I receive on a business adress at google (service@mydomain.com)

but I get the following error

[AUTH] Web login required: https://support.google.com/mail/bin/answer.py?answer=78754

I tried all the ressources given by google for allowing a less secure app to access the account but it doesn't help;

I get messages from google that it blocked an attempt to log into the account from the us (I am in Europe).

Do you have an idea on how to overcome this problem ?