Back

Using SMTP Relay with Exchange Online

This post from the Microsoft Online team is just what I needed for a Microsoft CRM email router project last weekWith the deployment of theAugu...

2 min read
Published on Sep 5, 2009
Using SMTP Relay with Exchange Online

This post from the Microsoft Online team is just what I needed for a Microsoft CRM email router project last week.

With the deployment of the August Service Update complete, SMTP clients can connect to Exchange Online SMTP servers and authenticate using Microsoft Online Services user credentials to send mail. The connection requires Transport Layer Security (TLS).

SMTP Relay capability allows organizations to use Exchange Online as an SMTP service for mail originating outside of the Exchange Online environment, for example SMTP-enabled applications such as fax servers.

To connect to the Microsoft Online Services SMTP server, open the SMTP client application and provide the following information:

· The fully qualified domain name (FQDN) of the Microsoft Online Services SMTP server. The FQDN will be slightly different depending on which Microsoft Online Services Data Center your organization is connected to. The server FQDNs are:

o North America Data Center: Smtp.mail.microsoftonline.com

o Europe Data Center: Smtp.mail.emea.microsoftonline.com

o Asia Pacific Data Center: Smtp.mail.apac.microsoftonline.com

· The user name and password of a Microsoft Online Services user account with an Exchange Online license.

o On most client applications, this is under “My outgoing mail server (SMTP) requires authentication” – this should be configured “Yes”, and the corresponding Microsoft Online username and password supplied.

· The SMTP port to use: 587.

o On most client applications, this is under “Server Port Numbers for Outgoing Server (SMTP)” – this should be configured to use port 587

· Make sure that Transport Layer Security (TLS) is enabled in your SMTP client.

o On most client applications, this is under “My outgoing mail server (SMTP) requires an encrypted connection (SSL)” – this should be configured “Yes”

NOTE: The FROM address must use a SMTP domain of type “Authoritative” – this can be confirmed in Microsoft Online Administration Center, under the Users - Domains tab.

Important: Remember to update the user Microsoft Online Services Account password regularly, before the password expires, or your SMTP-enable application will be unable to connect and send email. Microsoft Online Services passwords expire every 90 days.

Read the complete article @> Microsoft Online Services Team Blog : Using SMTP Relay with Exchange Online

This post has matured and its content may no longer be relevant beyond historical reference. To see the most current information on a given topic, click on the associated category or tag.

Related Posts

GCC High Licensing Requirements for Small Businesses

GCC High Licensing Requirements for Small Businesses

Learn the licensing requirements for small businesses seeking Microsoft 365 GCC High, including minimum user counts, eligibility, and steps for purchasing secure cloud licenses.

Sep 12, 2025
7 min read
GCC vs. GCC High: CMMC Ain’t Just Some Box to Check

GCC vs. GCC High: CMMC Ain’t Just Some Box to Check

Think GCC is “close enough” for CMMC Level 2? Think again. We break down GCC vs. GCC High and why compliance isn’t just a licensing checkbox.

Sep 12, 2025
6 min read
Microsoft 365 and Azure Backup Challenges

Common Challenges in Backing Up Data in Microsoft 365 and Azure

Explore common challenges in backing up Microsoft 365 and Azure data, from compliance gaps to recovery limitations, and how to overcome them.

Sep 12, 2025
5 min read
Cloud Solutions for FAR CUI Compliance with FedRAMP

How Cloud Solutions Support FAR CUI Compliance with FedRAMP

Discover how cloud solutions help meet FAR CUI compliance with FedRAMP. Learn about security standards, cloud service providers, and government-approved solutions for protecting Controlled Unclassified Information (CUI).

Sep 11, 2025
5 min read
Microsoft 365 Native Backup vs Third-Party Solutions

Key Differences Between Microsoft 365 Native Backup and Third-Party Solutions

Compare Microsoft 365 native backup with third-party solutions. Learn which offers better data protection, compliance, and recovery flexibility.

Sep 11, 2025
6 min read
Understanding the GCC High Validation Process

Understanding the GCC High Validation Process

Learn how Microsoft validates organizations for GCC High, including eligibility requirements, documentation, and approval timelines for secure cloud access.

Sep 3, 2025
8 min read

Ready to Secure and Defend Your Data
So Your Business Can Thrive?

Fill out the form to see how we can protect your data and help your business grow.

Loading...
Secure. Defend. Thrive.

Let's start a conversation

Discover more about Agile IT's range of services by reaching out.

Don't want to wait for us to get back to you?

Schedule a Free Consultation

Location

Agile IT Headquarters
4660 La Jolla Village Drive #100
San Diego, CA 92122

Secure. Defend. Thrive.

Don't want to wait for us to get back to you?

Discover more about Agile IT's range of services by reaching out

Schedule a Free Consultation