To help keep your Gmail account secure, Google will no longer support the use of third-party apps or devices which ask you to sign in to your Google Account using only your username and password.
The below information guide you to setup a App password usage from your Google account which you can use the generated password for Bosch IP camera alarm email notification setup.
Creating App password in your google account:
Enable 2-Step Verification (2FA) for your google account.
If it is disabled go to your account security section: https://myaccount.google.com/security
Configure Alarm email for Bosch IP camera