ScheduleOnce uses a basic SMTP connection to connect to your Google Account. The connection is completely secure and ScheduleOnce does not have access to your Google login. However, Google considers basic SMTP authentication to be less secure than connecting through the Gmail API.
In order to connect the Google email server in Email from your domain, you must either enable access to less secure apps or use 2-Step Verification with an application-specific password, depending on the authentication setting of the Google account you are trying to use.
In this article, you'll learn how to handle a connection error when setting up Email from your domain with a Google email server.
Enable less secure apps
The access to less secure apps setting is account-specific, so you must update the Google account for the mailbox you wish to use.
Log in to the Google account of the mailbox that you want to use for Email from your domain.
In the Allow less secure apps section, click Turn on access (Figure 1).
In the Less secure app access page, toggle All less secure apps ON (Figure 2).
Figure 2: Allow less secure apps
Note Access to the less secure apps setting will not be available and will be hidden in the following scenarios:
- 2-Step Verification is enabled for your account. Such accounts require an application-specific password for less secure apps access.
- Your G Suite administrator locked the less secure app account access. In this case, you must use 2-Step Verification with an application-specific password.
Generate an app-specific password for 2-Step Verification
If you are using 2-Step Verification, you'll need to generate an application-specific password in your Google Account and use it as your password in the Send Email from your domain page.