Getting Your DNS Ducks in a Row
In this article, Damian Scoles discusses what DNS records should be in place for Exchange Online, why these records are needed, and how to validate that DNS is properly configured.
September 6, 2023
Latest Articles
Why a Potential Autodiscover Flaw is Just the Tip of an Iceberg
It's often helpful when security researchers like Guardicore shed light on flaws in Microsoft Exchange - however, the Autodiscover protocol isn't flawed in the way they describe. Even though the issue is hard to replicate, it shouldn't distract from the work you need to do to protect your organization from the underlying reason why people want your credentials.
September 28, 2021
Understanding the Impact of Latency on Office 365 Service Performance
Many aging corporate networks were initially built to secure internet browsing traffic; however, this can create a slow user experience for those legitimately consuming cloud services. This article identifies contributing factors to network latency issues and the steps you can take to improve Office 365 service performance.
May 25, 2021
Exchange Server 2016 Migration – Client Access Namespace Cutover
Performing the cut over of client access namespaces during a migration to Exchange Server 2016.
December 8, 2016
Emails from Website Not Received in Exchange or Exchange Online
Emails sent using web forms on a website may not be received in the mailbox of the recipient due to a configuration or filtering issue.
March 22, 2016
Event ID 9041, An exception has been thrown: Microsoft Exchange Assistants TransientMailboxException
I recently encountered a mail flow problem between two of my test lab environments that was being caused by the DNS configuration on the receiving server's network interface.
January 12, 2016
A Sender Policy Framework (SPF) Primer for Exchange Administrators
Learn how Sender Policy Framework (SPF) records work to prevent email spoofing, and how you can implement the correct SPF record for your domain.
December 7, 2015
Testing Connectivity and DNS Changes with a Hosts File
How to use hosts files on client computers for Exchange Server testing and troubleshooting scenarios.
July 14, 2015
Use PowerShell to Quickly Check Multiple MX Records
How to use the Resolve-DnsName PowerShell cmdlet to query MX records for multiple domain names at once.
June 4, 2015
Manually Configuring DNS Lookups for Exchange Server 2013
How to manually configure the DNS servers used by Exchange Server 2013 for external lookups.
April 2, 2013
Managing Changes to MX Records and Incoming Email Traffic
How to plan, test and implement changes to MX records and inbound email traffic routes in an Exchange Server environment.
November 22, 2012
Email Fundamentals: What is an MX Record, and How Do They Work?
In this article I explain just what an MX record is and how they play a role in a working email system.
August 6, 2011