“550 5.7.512 Access denied, message must be RFC 5322 section 3.6.2 compliant and include a valid From address”

Email sent from on premise application servers and bound for office 365 recipients fails with the following error: “550 5.7.512 Access denied, message must be RFC 5322 section 3.6.2 compliant and include a valid From address” In the logs of your sending server you may see an SMTP conversation similar to: 220 BL2FFO11FD032.mail.protection.outlook.com Microsoft ESMTP MAIL Service…

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General Guidance on combating spoofing

As an Escalation Engineer for Exchange Online we get lots of questions on how to stop email spoofing. It is a very broad topic and there are a number of things that can be done. Below is sone general guidance I provide to my customers when this topic comes up. Last updated January 6th 2016 =================================================================  Combating email spoofing…

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Using EWS impersonation and PowerShell to log into an Exchange Online Mailbox

 Below is very basic PowerShell sample that will log into a mailbox in Exchange Online with another account which has the right to impersonate other mailboxes in your tennant. This can be very useful when there is a need to connect to multiple mailboxes in Exchange Online to perform various tasks. Using this method will…

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Office 365 Reporting web service

Some great new reporting features just released for Office 365. http://msdn.microsoft.com/en-us/library/jj984325.aspx A lot of these reports can be very useful in troubleshooting your environment. Especially the connection oriented ones for troubleshooting application connectivity into Office 365. Which is a big generator of support calls we see into Tier 3 support! I will be adding some…

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HTTPS Inspection incompatible with DIRSYNC tool for Office 365

So for my first blog post, I thought I would talk about an issue I ran across while working to setup an on-premises Exchange 2010/2013 DIRSYNC to Office 365 through a forward proxy server. (In my case proxy was TMG 2010, but the same concepts should apply for third party forward proxy solutions.) We have…

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