If you are using Google mail servers for your domain and you never set up 2-Step Authentication, Then you will now have to do so. Google now requires anyone using 3rd party apps with their mail servers to do this.
If you received an email from us with the subject "SMTP Issue Detected" then you will need to set up 2-Step Authentication and get an app password from google. The links below will help.
NOTE: When you select the App, use Other and put your domain in there. It will then give you a popup with the password you can then use.
https://www.dynamicidx.com/kb/google-2step-verification
https://info.dynamicidx.com/knowledgebase/2/Setting-up-SMTP-for-Administrator-accounts.html
