The most common Azure function types are queue triggered and http triggered functions. In my experiment I decided to go with queue triggered functions with Azure service bus queueing.

With the introduction of Event Grid, Microsoft Azure now offers an even greater choice of messaging infrastructure options. The expanded messaging service fleet consists of the Service Bus message broker, the Event Hubs streaming platform, and the new Event Grid event distribution service.

There's an important distinction to note between services that deliver an event and services that deliver a message. Azure offers three services that assist with delivering event messages throughout a solution. These services are: Event Grid Event Hubs Service Bus

A significant benefit of using Azure Functions to process our messages is the billing model. Another benefit is a huge reduction in code we have to maintain. Reliably Processing Azure Service Bus Topics with Azure Functions

A 2 part practical series video explaining how to build a email processor using queueing and serverless function technique

It’s honestly a great question — and it’s a question with consequences. Each of these messaging technologies comes with its own set of behaviors that can impact your solution.