Sending Emails from Azure Logic Apps & Service Bus

Pre-requisites to follow along this tutorial

Azure Account
Email Provider (such as Post-mark, SendGrid…)

Sending Emails through Azure Logic Apps become easier in most of the business requirements, specially triggered by Azure service bus, to learn more about Azure service bus please use the following link https://docs.microsoft.com/en-us/azure/service-bus-messaging/service-bus-messaging-overview

now let’s back to the point.

Azure Service bus messages can be queued based on topics and subscriptions, it will be categorized as following hierarchy

Service bus namespace
- Topic
  - Subscriptions

Steps to Follow

Create a Resource Group and Create a Logic App

Create a new workflow

in Designer View Your Trigger Should be as follows

When messages are available in a topic subscription

Provide Your connection string of Service Bus with Topic and Subscription Name

Sample ARM template for your Logic App as follows

{
    "inputs": {
        "parameters": {
            "topicName": "your-topic-name-here",
            "subscriptionName": "your-subscription-name-here"
        },
        "serviceProviderConfiguration": {
            "connectionName": "serviceBus",
            "operationId": "receiveTopicMessages",
            "serviceProviderId": "/serviceProviders/serviceBus"
        }
    },
    "splitOn": "@triggerOutputs()?['body']"
}

Create an HTTP Action
Method: POST
URI: Your Email Providers Post API endpoint URI

Headers: Probably Your Authentication Token and Other Header Details Comes under header section

Body: You can extract your Message from Service in Body Section I will provide a sample ARM template below

 { 
    "inputs": { 
        "method": "POST", 
        "uri": "your-email-service-provider-API-endpoint", 
        "headers": { 
            "token": "your-authentication-token", 
            "content-type": "application/json" 
        }, 
        "body": { 
            "From": "@triggerOutputs()?['body']?['UserProperties/from']", 
            "HtmlBody": "@triggerOutputs()?['body']?['UserProperties/htmlBody']", 
            "ReplyTo": "@triggerOutputs()?['body']?['replyTo']", 
            "Subject": "@triggerOutputs()?['body']?['UserProperties/subject']", 
            "To": "@triggerOutputs()?['body']?['to']" 
        } 
    } 
}

that’s it, save the workflow, and your workflow will be triggered every time your Service received a message on specific subscription which you provided while you are creating the trigger.