Duplicate Exchange Online and Exchange Server Mailboxes

With a hybrid Exchange Online deployment, where you have Exchange Server on-premises and Exchange Online configured in the cloud, and utilising AADConnect to synchronize the directories, you should never find that a synced user object is configured as both a mailbox in Exchange Online and a mailbox on-premises. When Active Directory is synced to Azure… Continue reading Duplicate Exchange Online and Exchange Server Mailboxes

Is Your SenderID/SPF or DKIM Record Correctly Configured

With Microsoft having just announced that DKIM is coming to Office 365 soon (release notes here) and SenderID is already available, I thought this is a good time to write a blog on the use of DMARC to show if your records are correct. DMARC is a protocol that allows you to see the effect… Continue reading Is Your SenderID/SPF or DKIM Record Correctly Configured

Highly Available Office 365 to On-Premises Mail Routing

This article looks at how to configure mail flow from Office 365 (via Exchange Online Protection – EOP) to your On Premises organization to ensure that it is highly available and work in disaster recovery scenarios with no impact. It is based on exactly the same principle to that which I blogged about in 2012:… Continue reading Highly Available Office 365 to On-Premises Mail Routing

Creating GeoDNS with Amazon Route 53 DNS

UPDATE: 13 Aug 2014 – Amazon Route 53 now does native GeoDNS within the product – see Amazon Route 53 GeoDNS Routing Policy A new feature to Exchange 2013 is supported use of a single namespace for your global email infrastructure. For example mail.contoso.com rather than different ones for each region such as uk-mail.contoso.com; usa-mail.contoso.com… Continue reading Creating GeoDNS with Amazon Route 53 DNS

Highly Available Geo Redundancy with Outbound Send Connectors in Exchange 2003 and Later

This is something I’ve been meaning to write down for a while. I wrote an answer for this question to LinkedIn about a week ago and I’ve just emailed a MCM Exchange consultant with this – so here we go… If you configure a Send Connector (Exchange 2007 and 2010) or Exchange 2003 SMTP Connector… Continue reading Highly Available Geo Redundancy with Outbound Send Connectors in Exchange 2003 and Later