Exchange 2010 Users have to be Domain admins in order to send emails

Someone set up our exchange server and domain controller a year ago, recently I noticed that the domain users group was under domain admins, when I removed them from domain admins all users were unable to send emails, when asking the person that set up our exchange server why it is like that he simply answered "it's supposed to be configured that way", I know that this is not the proper way but can't figure out how to fix this issue, so at the moment all domains users are domain admins.

Any suggestions will help please.
huberthphamAsked:
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Simon Butler (Sembee)ConsultantCommented:
Not, it isn't supposed to be configured that way. The person who setup the server didn't know what they were doing.

My instinct is that the users don't have the correct permissions.
The first thing to do is check that permission inheritance is enabled on their account in ADUC on the security tab.

Simon.
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huberthphamAuthor Commented:
I am sorry, so the users are able to send out emails now, but they aren't able to receive emails unless their admins.
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Simon Butler (Sembee)ConsultantCommented:
And what happens when an email is sent? You need to provide more information.

Simon.
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huberthphamAuthor Commented:
it says mailbox unavailable. But the user is able to receive emails fine. this happens to external and internal emails.
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Simon Butler (Sembee)ConsultantCommented:
You get an NDR at the point of delivery?
have you checked the permissions like I suggested?

Simon.
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huberthphamAuthor Commented:
There is no NDR, I checked the inherit permissions box as well. some accounts seem to be working. It seems like it's only the accounts on pop3 that aren't working properly. Any account set up using exchange works fine.
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Simon Butler (Sembee)ConsultantCommented:
"It seems like it's only the accounts on pop3 that aren't working properly"

What do you mean by that? Where does POP3 come in to it?

Simon.
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huberthphamAuthor Commented:
We have our home office users on exchange, and the remote users are using Pop3. Not sure why it is setup that way. Should I try changing the Pop3 users over to exchange?
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Simon Butler (Sembee)ConsultantCommented:
If you are using Outlook and have Exchange 2010, then Outlook Anywhere would be the preferred connection method of choice. Rather than the awful POP3 connection.

Simon.
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