What Are the SMTP Settings for Office 365? Step-by-Step Guide

What Are the SMTP Settings for Office 365?

The SMTP settings for Office 365 (now Microsoft 365) are: SMTP server: smtp.office365.com, Port: 587, Encryption: STARTTLS (TLS), and Authentication: required using your full email address and password. These settings are used to send outgoing email securely from email clients, applications, websites, and devices.

Now let’s explore these settings in detail, explain when to use them, and understand how SMTP works within Office 365.

Microsoft 365 SMTP Settings Overview

Here are the official SMTP settings for Office 365 (Microsoft 365):

SettingValue
SMTP Serversmtp.office365.com
Port587
EncryptionSTARTTLS (TLS)
AuthenticationRequired
UsernameFull email address (e.g., user@yourdomain.com)
PasswordEmail password or app password

These settings are used for SMTP client submission, which allows users and applications to send emails through Microsoft 365 servers.

What Is SMTP Client Submission?

SMTP client submission is the most common method for sending email from:

  • Outlook desktop

  • Mobile mail apps

  • WordPress websites

  • CRM systems

  • Multifunction printers

  • Line-of-business applications

When you use smtp.office365.com on port 587 with TLS encryption, your email is securely transmitted to Microsoft’s servers for delivery.

Read More: What Are the SMTP Settings for Office 365?

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