Enhanced Google security sometimes sees Method:CRM's IP addresses as unsecure (which they are not), so Google won't let some users set their email preferences.
If you have experienced this problem, you will have received an email from Google saying:
sign in attempt blocked or
someone has your password
To fix this problem, you should
Enable 2-Step Verification
1. In Gmail, open your account settings by clicking the Google Apps icon at the top and then Account in your Google apps.
2. In your account, on the left menu, click Security.
3. Scroll to find Signing in to Google. Click 2-Step Verification and follow the wizard to enable it. You will need to verify it is you by entering your password.
Generate an App Password
Once 2-Step Verification is enabled, you will see another option within Signing in to Google. This option does not show if 2-Step Verification is not enabled.
1. Click App passwords and then you verify it is you by entering your password.
4. Click Select app and then choose Other (Custom name) from the dropdown list.
5. Select a name for the app. In the below example, we used "Method". Click Generate.
6. You will then be given the password key for this app as highlighted in dark yellow below. Screenshot or store this in a safe place as this is not stored anywhere. Go back to Method and paste in this password in the Gmail server settings for the email password.
And that's it! You're done!