Azure SMTP Relay for Email Sending and Delivery

Azure SMTP Relay is a service that allows you to send emails from your Azure application or service. It provides a secure and reliable way to send emails to external recipients.

With Azure SMTP Relay, you can send emails using a relay service that is integrated with your Azure application or service. This eliminates the need to manage your own email infrastructure.

You can use Azure SMTP Relay to send emails to any email address, including Gmail, Outlook, and other popular email services. This makes it a versatile solution for a wide range of applications and services.

Azure SMTP Relay also provides features such as authentication, encryption, and delivery tracking, which help ensure that your emails are delivered securely and reliably.

Azure Communication Service Email is still under public review and can't be used in production until it becomes generally available. This means you can't rely on it for sending emails in production environments.

Azure email has limitations when it comes to sending volume. Users can send a limited number of emails, and it's not suitable for large-scale email sending.

Microsoft doesn't allow outbound SMTP communication from Azure since November 5, 2017, to protect Azure data center IP addresses from reputation abuse. This restriction applies to unauthenticated email delivery via SMTP port 25 through direct DNS MX lookups.

To overcome these limitations, you need an authenticated SMTP relay service. This is also known as a Smart Host, with TLS support. It provides an intermediary SMTP server between the mail servers of the sender and recipient.

Using SMTP relay services reduces the likelihood that an email provider will reject your email. This maintains the sender reputation.

Here are the main reasons why it's better to use a third-party SMTP service:

To set up an SMTP relay, you'll need to use an authenticated SMTP relay service, also known as a Smart Host, with TLS capability to deliver emails from Azure VMs or Apps.

You can use services like MailSlurp, Office 365, or Elastic Email, among others, which integrate with Azure. For example, MailSlurp is a popular SMTP relay service that Microsoft Azure integrates with.

To get started, you'll need to find your SMTP server credentials, which can be found in the API and SMTP tab of your Mailtrap Email Sending account, or in your Office 365 subscription.

You can use Office 365 as a SMTP relay service to send and receive emails from Azure web apps. If you have an Office 365 subscription, you're good to go.

To send emails, you'll need to use the System.Net.Mail class and your SMTP server credentials. Check out the script mentioned in the article for an example of how to do this.

MailSlurp is another popular SMTP relay service that integrates with Azure, but you can also use other services like Elastic Email or SocketLabs. The choice is yours.

Secure ports 587 or 443 are used to establish a TCP connection with your SMTP relay service. Other SMTP ports might also be supported.

If you're looking for more information on sending emails from frameworks compatible with Azure, check out the blog posts about Go, Python, JavaScript, Java, and C#.

You can use System.Net.Mail to send emails from Azure with Office 365, as described in Example 2. This involves inserting your SMTP server credentials and employing the System.Net.Mail class.

To get started, you'll need an Office 365 subscription, which will give you access to the necessary SMTP server credentials. These credentials are used in the System.Net.Mail class to send emails from Azure web apps.

The System.Net.Mail class is a built-in .NET class that allows you to send emails using SMTP. You can use this class to send emails from Azure, as long as you have the necessary SMTP server credentials.

Here are the basic steps to send an email using System.Net.Mail:

1. Create an SmtpClient using the Azure Communication Services host Url and the Smtp Authentication credentials.

2. Create a MailMessage.

3. Send using the SmtpClient's Send method.

Note that you'll need to have an active Azure account and an Azure Communication Email Resource created and ready with a provisioned domain, as well as an active Azure Communication Services Resource connected with Email Domain and a Connection String.

You can use an SMTP relay service like Mailtrap to send emails from Azure.

To integrate Mailtrap Email Sending in your app, you should use the SMTP client library for your programming language. For example, you can install the Nodemailer library in the Azure project using the following command: `npm install nodemailer`.

To create an SMTP client, you need to import the library and create a new transporter object. Specify the credentials, such as host, port, username, and password, which you can find in your Email Sending account.

You can also use Azure Logic Apps to send emails with Mailtrap via SMTP as a response to specific events. To do this, create a new Logic App and press 'Add'. Fill out the empty fields by choosing the resource group, Logic App name, Region, Plan Type, and Zone redundancy.

To send emails using System.Net.Mail.SmtpClient, you need to create an SmtpClient using the Azure Communication Services host Url and the Smtp Authentication credentials. Create a MailMessage and send using the SmtpClient's Send method.

You can also use Send-MailMessage to send emails from Azure. The From value is the mail from address of your verified domain, and the To value is the email address that you would like to send to.

Using an Office 365 subscription, you can send and receive emails from Azure web apps. You'll need to insert your SMTP server credentials and employ the System.Net.Mail class.

Here are some common SMTP relay services:

You can also use the MailSlurp SMTP relay to test email delivery in Azure. To do this, connect to the SMTP relay server and send an email from it without requiring authentication.