Best ways of verifying that DKIM & DMARC security for Office 365 have been properly implemented

What are the best ways of verifying that DKIM & DMARC security for Office 365 have been properly implemented and configured?
IT GuyNetwork EngineerAsked:
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gilnovSystems AdministratorCommented:
If you just want to do a quick check to see if the checks are passing or failing, send a message from your O365 account to an external email address then look at the message headers. You'll see an "authentication results" section where the results of the DKIM and DMARC checks will be displayed (pass/fail).

If you want to dig deeper, DKIM/DMARC analyzers are just a search away. Here's one of my favorites:

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IT GuyNetwork EngineerAuthor Commented:

Can you provide me with an example of what you are talking about with the "authentication results" section where the results of the DKIM and DMARC checks will be displayed as pass or fail)?
gilnovSystems AdministratorCommented:
Sure. First you need to send a message from your O365 domain account to an outside account that you have access to such as google or yahoo or another company - anything that routes your message across the Internet (DKIM and DMARC only apply to messages that travel across the Internet).

Next you need to access the message headers from the RECIPIENT (outside) mailbox. The exact steps for viewing the message headers will depend on the email client or web site you are using.

Once you are looking at the message headers, scan for the "Authentication Results" section and you will see statements there that describe what happened with the DKIM and DMARC (and SPF) checks. Usually it just says "pass" or "fail" but sometimes there is more info. Typically, it will be a brief description like "[IP address] is (or is not) a designated sender for [domain]" or "DKIM=pass", etc.

This wikipedia article provides a good overview of how the various authentication and anti-spam/anti-spoofing measures work together:
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