Is there a way to send a Gmail message or create a notification when a daily email is not received?

Question

I receive an email that is only important when not received. Is there a way to be alerted that the message is missing?

Answer 1

This is possible if the email has some kind of identifier, e.g. sender or subject

• You can write e.g. an Apps Script code that runs on daily trigger
• The script will search for all inbox threads or messages fulfilling your criteria
• You can specify the criteria (such as date, sender, subject etc.) with the search query q parameter
• See here for more informaiton about the Gmail API method Users.messages: list

Mind: Filtering messages with a query is best done with the Gmail API, however in order to implement a daily trigger it is convenient to use Apps Script. The Gmail aPI can be easily implemented in Apps Script an an Advanced Service.