1) First you need to go to your Google Account.
For that, you can start at your Mail inbox;
Click on the user icon on the top right.
Make sure you are logged in with the mail you are going to use on RENTLY's general configuration.
Click on "Manage your google Account"
Once there, go to "Security".
If not already configured, you will need to set up 2 Step Verification.
Once 2 Step Verification is set up, use the search bar to find the "App Passwords" section.
The first step to create an App Password is to input an app name, here you can use a generic name like "Rently-Email"
After clicking on create you will receive a pop up with a code.
This code should be pasted on Rently without spaces, under General Configuration -> Mail Configuration -> Password.
for example if the code is epah ruqv jhkc bqnv, you should paste epahruqvjhkcbqnv
The Mail Configuration tab should be completed with the following values:
Send email notifications: This option should be turned on
Host: smtp.gmail.com
Port: 465
Enable SSL: SslOnConnect
Use Credentials by default: this option should be turned off
User: [The mail address you are configuring]
Password: [The app password generated]
Once completed it should look like this: