Exchange 2010 "Send As" and "Send on behalf of"

Two departments in my company have complained to me that when they send out emails on behalf of "Sales" and "Finance", some recipients can see the email address of the person sending the email.

This is strange because when they sent emails to my Gmail and hotmail account, only Sales and Finance appeared without showing the names of the person sending the email.

Do different email servers handle "sent on behalf of" emails differently to Gmail and Hotmail?

Is there a way I can ensure all emails sent on behalf of Sales and Finance never display the user's email address? The reason is when some people reply to these emails, the emails are going directly to the person who sent the email instead of the Sales or Finance inbox.

I hope that all makes sense.
DonKwizoteAsked:
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Rodney BarnhardtServer AdministratorCommented:
It looks like it is dependent on the client. Some clients, especially external ones, will read additional header information and display all. I do not think there is a way around it since it is based on the receiving client.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_24332547.html
Will SzymkowskiSenior Solution ArchitectCommented:
Send As and Send on Behlaf of are 2 completely different levels of access. Send As is specifically a AD permission and Send on Behlaf of is Exchange permission based. Never use both of them in tandum. Use either Send As of Send on Behlaf of as i have seen in many situations where having both enabled on a single account can cause weird symptoms like what you might have been experiencing.

Will.

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DonKwizoteAuthor Commented:
Thanks
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