Office 365 smtp mail relay

Office 365 provides a built-in SMTP mail relay service that allows you to send emails from your application or service using your Office 365 credentials. Here's a step-by-step guide to set up an SMTP mail relay in Office 365:

Prerequisites:

1. You have an Office 365 account with a valid username and password.
2. You have a domain registered with Office 365 (e.g., contoso.com).
3. You have a valid SSL/TLS certificate (optional but recommended).

Step 1: Enable SMTP Relay

1. Log in to the Office 365 admin center (https://admin.microsoft.com).
2. Go to Settings > Services & add-ins > Connectors.
3. Click on Microsoft 365 > SMTP relay.
4. Toggle the switch to On to enable SMTP relay.

Step 2: Configure SMTP Relay Settings

1. In the SMTP relay page, click on Configure.
2. Enter the following settings:
   • Server name: smtp.office365.com (or smtp.office365.com:587 if you want to use port 587).
   • Port: 587 (or 25 if you want to use port 25).
   • Authentication: Select Username and password.
   • Username: Your Office 365 username (e.g., [email protected]).
   • Password: Your Office 365 password.
   • Encryption: Select TLS (or SSL if you prefer).
3. Click Save to save the changes.

Step 3: Configure Your Application or Service

1. In your application or service, configure the SMTP settings to use the Office 365 SMTP relay:
   • Server: smtp.office365.com (or smtp.office365.com:587 if you're using port 587).
   • Port: 587 (or 25 if you're using port 25).
   • Authentication: Use the same username and password you entered in Step 2.
   • Encryption: Use TLS (or SSL if you prefer).

Tips and Considerations:

• Make sure to use the correct server name and port number in your application or service.
• If you're using a custom domain, you may need to configure DNS records to point to Office 365's mail servers.
• Office 365 has rate limits on the number of emails you can send per hour. If you exceed these limits, you may need to implement a queuing system or use a third-party email service.
• If you're using a self-signed certificate, you may need to configure your application or service to trust the certificate.

By following these steps, you should be able to set up an SMTP mail relay in Office 365 and send emails from your application or service using your Office 365 credentials.