If you use Google Forms in your instruction, the add-ons below will be helpful. They do the same job, that is, they allow you to automatically send email notifications to respondents of your Forms. While Form Notifications by Google is pretty basic and simple to use, Email Notifications by Digital Inspiration offers way more features and functionalities especially its premium version. You may want to try them out and see which one works best for you.
This add-on lets you automatically notify Forms respondents via email when they submit your Google Forms. You can customize your email notification the way you like. You can also include links to upload Google Drive files if you choose to include a file upload field in your Form.Another cool feature is the ability to attach various file formats from your Google Drive (e.g., PDF, Microsoft Office, Music Video, Zip Archives, etc) to your notification email. You can also include 'dynamic barcodes and QR codes in email messages generated from Form answers.'
The free version of this add-on allows users to email up to 20 Form responses per day, premium users can send up to 1500 email responses. Additionally, "premium users can create conditional rules and send customized emails to different people depending on the user's selection in the form. Conditions can be simple (like when the customer selects iPhone, send an email to iPhone support team) or you can use RegEx for specifying more complex conditions (like send emails to the Asia Pacific group when the selected country is Japan or Singapore)."
Form Notifications, an add-on provided by Google, enables users to automate email notifications for:"
1. Form respondents - Configure messages that are delivered as individuals submit the Forms submission
2. Form owners and editors - Configure messages that are delivered to you (as the creator of the Form), or other collaborators, on predetermined response thresholds".