Analyzing an e-mail message with Message Analyser - Troubleshooting
Microsoft has developed the Message Header Analyzer tool that you can use to analyze an e-mail message. In this tool, you copy the e-mail headers that are then presented clearly legible in a graphical representation.
Open Message Analyser
Navigate to: https://mha.azurewebsites.net/
Open message details
Open a message you wish to analyze.
Copy a message header via Office 365 Online
Copy and paste the full message details into the message analyzer.
This can also be done for Gmail, Hotmail, Yahoo, Zoho, Hey, Zimbra,...
Press Analysis header
Through this view, you are able to easily analyze a message.
For example, Spam Score. You can click on the left side on the fields to get more information from the results.
Best compare your problem emails with emails that receive well.
Restore a mailbox to another mailbox when deleted -. Exchange Online
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Install the new Exchange Online PowerShell V2 module
Mailbox management via Hybrid Exchange
Add an email alias in Office 365, Exchange or Active-Directory