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How to know if you're sending emails to a MS Exchange distribution list

Hello, in my company we're starting a newsletter suscription program for our clients and we want to have a limit of 5 email addresses per suscription.

Is there any way to track if one of those adresses that our client give to us is a distribution list or if the mail is being redirected to another users on their organization?
1 Solution
Kruno DžoićSystem EngineerCommented:
send mail to address you want to check with delivery and read request
ScreenFoxAuthor Commented:
Does that work even if the user is using some Transport rule to redirect the message?
Yes via Trasnport Rule Read receipt can be blocked, it was not possible in excahnge 2003.

But in 2007 and later version its possible via Trasnport Rule.
Simon Butler (Sembee)ConsultantCommented:
I would go as far as to say there is nothing you can do to detect the use of a group.
A redirected transport rule wouldn't be seen. You might get a few read reciepts, but if you were to send me a message with a read receipt then you wouldn't get one back, as I consider them rude.

Then what is to stop someone from using a rule to forward the email to other accounts?

You could try putting something in the message to see how many times the email is opened, but that can get you flagged as spam.

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