Exchange 2003, Only Allow Domain Users to Send Emails

I need to configure exchange 2003 to only send email from mydomain.com users, not public domains like aol or yahoo.  Also is there a way to clear the outbound message Queue all at once?  There is about 3.7GB of spam being sent out.  Thanks!
JJMarquartAsked:
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Alan HardistyCo-OwnerCommented:
Please have a read of my article and make sure you are not an Authenticated Relay:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2556-Why-are-my-outbound-queues-filling-up-with-mail-I-didn't-send.html

Also check on www.checkor.com to see if you are an Open Relay as this isn't good news.
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JJMarquartAuthor Commented:
I found the account being abused and deleted it.  Now I have a few emails in trying to send from Administrator@mydomain.com and SERVER-IS@mydomain.com.    The administrator account is, and has been disabled for some time.    What should I do now?
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Alan HardistyCo-OwnerCommented:
Where are the administrator emails trying to be sent to (who is the recipient)?
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JJMarquartAuthor Commented:
Weird,  the recipient is administrator@mydomian.com
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Alan HardistyCo-OwnerCommented:
Please re-enable the administrator account.
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JJMarquartAuthor Commented:
OK, its re-enabled
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Alan HardistyCo-OwnerCommented:
Has the queue now emptied?
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JJMarquartAuthor Commented:
I tried to login to the administrator account with success but outlook would not connect.  I was also getting a postmaster@mydomain.com.   I addedd both the postmaster and administrator account to the sender filtering list.
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Alan HardistyCo-OwnerCommented:
Okay - so do you need anything more now?
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JJMarquartAuthor Commented:
even with the sender filter they are still poping up in the que.  should that happen?
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Alan HardistyCo-OwnerCommented:
How many Exchange Servers in your network?
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JJMarquartAuthor Commented:
One sbs
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JJMarquartAuthor Commented:
Whatever it is it's causing deco issues too when the que is filled up.  Don't want to do it but thinking about reloading.
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Alan HardistyCo-OwnerCommented:
I would be inclined to try and look at the contents of the messages.

Where did you login to the Administrator account from?  Server or a workstation?
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JJMarquartAuthor Commented:
Workstation
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Alan HardistyCo-OwnerCommented:
Can you try again - and check out what the messages are please?
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Alan HardistyCo-OwnerCommented:
Try OWA if Outlook won't play nicely.
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JJMarquartAuthor Commented:
what is the smtp connector "server.mydomain.internal"?  This is where the messages are building up.  I froze it and emails are still sending.
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Alan HardistyCo-OwnerCommented:
That is your own server.

Can you screen dump the queue please?
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Alan HardistyCo-OwnerCommented:
Comment https:#a38414956 resolved the bulk of the problem this question was about and also shows how to cleanup the queues, so should be accepted as the answer.

Alan
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