Determine where a message leaves an Office 365 tenant

When troubleshooting mail flow it is often important to determine where a message is handed off from a partner to your Office 365 tenant, or from your Office 365 tenant to a partner. This is easy to see in a message header, just look for the receiving host with the domain mail.protection.outlook.com, as this will…

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Ensure your SPF Record is Correct

Update: Feb 26, 2015 – A great post about Office 365 SPF checks was recently written by one of our program managers which I would high recommend reading. How Office 365 does SPF checks for customer-to-customer mail   I’ve recently seen an increase in cases that involve incorrectly published SPF records that have resulted in…

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Recipient Notifications

The ability to send a notification to the recipient when a transport rule triggers. This is a request that we have received from a lot of customers, and I’m happy to let you know that it is now rolling out in the form of an action in EOP transport rules. Sweet! Recipient Notifications Let’s say you…

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IP Ranges Added to EOP

On TechNet we publish the range of IP addresses that are used when sending mail out of a custom EOP connector. If you have created an EOP on-premises connector to deliver inbound mail to your on-premises mail environment, or an EOP partner connector to deliver mail to a partner, the IPs used in these situations…

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