Configure Office 365 SMTP Settings: A Step-by-Step Guide

April 12, 2023
configure office 365 smtp settings: a step-by-step guide

In today’s fast-paced digital landscape, efficient communication is crucial for businesses of all sizes. Office 365, Microsoft’s cloud-based suite of productivity tools, has become a cornerstone for many organizations. One key component of this suite is the Simple Mail Transfer Protocol (SMTP) server, which allows users to send emails from their Office 365 accounts. This comprehensive guide will walk you through configuring Office 365 SMTP settings, ensuring seamless email communication for your business.

Understanding SMTP and Its Significance

What is SMTP?

SMTP, or Simple Mail Transfer Protocol, is a standard communication protocol for transmitting email over the Internet. It enables the sending and receiving of emails between servers and clients for their email marketing campaigns. In Office 365, configuring Office 365 SMTP settings allows users to send emails from their accounts using external applications or devices.

Why Configuring SMTP Settings is Important in Office 365

Configuring Office 365 SMTP settings is essential for businesses that use third-party applications or devices to send emails. This could include CRM systems, marketing automation tools, or custom applications that require email functionality. These applications may communicate effectively with Office 365’s servers with proper configuration.


Benefits of Microsoft Office 365

Benefits of Microsoft Office 365

Microsoft Office 365 is an expansive collection of cloud-hosted productivity solutions and services provided by Microsoft. It encompasses widely used applications such as Word, Excel, PowerPoint, Outlook, OneDrive, and additional software offerings. Here are several benefits of using Microsoft Office 365:

  • Flexibility and Accessibility
  • Collaboration Made Easy
  • Always Up-to-Date
  • Large Storage Capacity
  • Integration with Desktop Applications
  • Enhanced Security and Compliance

Configuring Office 365 SMTP Settings

Prior to commencing the configuration process for Office 365 SMTP settings, ensure that you possess the following items:

Office 365 Account Credentials

You will need administrator-level access to your Office 365 account to access the Admin Center and configure Office 365 SMTP settings.

Internet Connectivity

Ensure that your system has a stable internet connection throughout the configuration process.

Step-by-Step Guide

Step-by-Step Guide: Configuring Office 365 SMTP Settings

Follow these steps to set up Office 365 SMTP settings:

Step 1: Accessing Office 365 Admin Center

Navigating to Admin Center

  • Log in to the Office 365 account using your admin credentials.
  • In the dashboard, locate and click on the “Admin” tile that will take you to the Admin Center.

Accessing Exchange Admin Center

  • Select “Exchange” from the left-hand menu within the Admin Center.
  • Select “Mail Flow” in the Exchange Admin Center and select “Connectors.”

Step 2: Configuring SMTP Relay

Enabling SMTP Authentication

  • In the “Connectors” section, click the plus (+) icon to add a new connector.
  • Opt for the “Office 365” configuration for mail flow and designate the “Partner organization” as the preferred mail flow scenario. Click “Next” to proceed.
  • Please choose the option “When a transport rule redirects messages to this connector” and proceed by clicking “Next.”
  • Name the connector (e.g., “SMTP Relay Connector”) and configure the settings according to your organization’s requirements.

Setting Up a Connector

  • Choose “Route email through these smart hosts” and click the plus (+) icon to add the intelligent host information provided by your SMTP service provider.
  • Follow the prompts to complete the connector setup.

Read More: How to Configure ATT Webmail SMTP Settings?

Step 3: Setting Up SMTP Client

Configuring SMTP Server Address

  • Obtain the SMTP server address provided by your SMTP service provider.
  • In your application or device settings, enter the SMTP server address.

Port Configuration

  • Use port 587 for secure TLS connections or port 25 for unencrypted connections.
  • Configure your application or device to use the appropriate port.

Authentication and Encryption

  • Enable SMTP authentication and provide the Office 365 account credentials that will be used to send emails.
  • If using a secure connection, ensure that TLS encryption is enabled.

Step 4: Testing SMTP Configuration

Sending a Test Email

  • Use your application or device to send a test email to a valid recipient.

Verifying Delivery

  • Check the recipient’s inbox to confirm that the test email was successfully delivered.

Troubleshooting Common Issues for Office 365 SMTP Settings

Authentication Failures

  • Verify that the correct Office 365 account credentials are used for SMTP authentication.

Port and Encryption Mismatch

  • Ensure that the chosen port and encryption settings match those configured in Office 365.

Blocked IP Addresses

  • Check if your SMTP service provider’s IP addresses are blocked by Office 365. Whitelist them if necessary.

Office 365 SMTP Configuration

Best Practices for Office 365 SMTP Configuration

Implementing Two-Factor Authentication (2FA)

  • Enhance security by enabling 2FA for your Office 365 accounts to protect against unauthorized access.

Regularly Monitoring SMTP Logs

  • Monitor SMTP logs to identify any unusual activity or potential security breaches.


Configuring Office 365 SMTP settings is critical in ensuring seamless email communication for your organization. By following this step-by-step guide and implementing best practices, you can harness the full potential of Office 365’s email capabilities. Regularly review and update your Office 365 SMTP settings to adapt to changing business needs and security requirements. With proper configuration, you’ll be well-equipped to communicate effectively and efficiently with your clients, partners, and team members.