Get Emails Messages with Blank Subject Lines

Question

I found a method to configure a Transport Rule for Messages That Have a Blank Subject on our tenant. But, before I add the rule, I would like to see which customers are currently sending us Blank subject line emails. Would anyone know if that feature is available using the Mail Flow/Message Trace option on Exchange Online or with a Get-MessageTraceDetail command on PowerShell? All articles on google i've found are older from 2007 and those methods are no longer available today.

Configuring the Rule:
bb430785(v=exchg.141)

Answer 1

Hi @Erick Lopez

Here is a link which may be helpful for your reference: Getting stats for emails delivered with blank subject lines
You may use the following cmdlet in EXO powershell to filter the senders who sent messages with blank subjects in the last 10 days (you may also specify the time period via adding the StartDate and EndDate parameters) :

Get-MessageTrace | Where {!$_.subject} | Select SenderAddress  

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