Many companies use the Google DNS servers ( and as forwarders to resolve internet addresses.

Whilst performing some exhaustive troubleshooting on Office365 & Outlook slowness & connection issues, we have uncovered incorrect addresses being resolved for EMEA customers.

When using Office365 in EMEA, is a CNAME record that should always resolve to either, or This means you access the servers closest to you, and don’t cross the Atlantic multiple times to get to your data.


I have seen multiple occurrences recently of Google’s servers resolving UK based clients to which causes mail opening times of between 3-8 seconds (depending on the message size) and a raft of other connection and disconnection issues.

I recommend not using Google’s name servers if you’re either using Office365 or rely on accurate name resolution, but either OpenDNS or the servers provided by your ISP.

I’ll shortly post a powershell script in the downloads section that will send an email if any of your nameservers return a non-emea result.

Leave a Reply

Your email address will not be published. Required fields are marked *