Exchange does not send mail out.

My Exchnage server stoped sending messages out, it gives me Sysytem Administrator to every message I try to send out.

at the bottom of the message it says:

#5.5.0 smtp;501 #5.1.1 bad address

Please help.
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Jeffrey Kane - TechSoEasyConnect With a Mentor Principal ConsultantCommented:
That's not the entire error message.  What does it say before that line?

Also are you able to RECEIVE email?  

Are you testing sending to various different domains?

Are all services running that should be?  (especially the SMTP service?)

BrentConnect With a Mentor DevOpsCommented:
check the configured DNS servers in system manager.  Make sure they still work, if not check with your isp to see what they should be.  I would also suggest adding some trusted external dns servers.

There is nitfy little tool called "dig" that allows you to test internal and external DNS servers for lookups.  I would suggest downloading and using this tool on the exchange server. 

I would also verify that the DNS client service is running on the exchange system.  If the exchange server is also a dns server, make sure the dns server is also running.
Hypercat (Deb)Commented:
Any event log errors?  Have you checked to be sure all the services are running? Is this happening with internal or external email, or both?  Is every user on the server having this problem?
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jdffAuthor Commented:
Full message:

our message did not reach some or all of the intended recipients.

      Subject:      Test
      Sent:      4/10/2007 4:00 PM

The following recipient(s) could not be reached: on 4/10/2007 4:01 PM
            There was a SMTP communication problem with the recipient's email server.  Please contact your system administrator.
            < #5.5.0 smtp;501 #5.1.1 bad address>
jdffAuthor Commented:
DNS is working fine.
log into the server, try sending an email manually using telnet

telnet mail.server.extension 25
helo whatever
mail to:<>
rcpt to:<>
whatever here
. ( single dot and then enter )

If you cannot connect, then do an nslookup from the server.  Use the dig tool to get the ip address and try to connect manually.

If all else, edit the host file with the correct ip, run a "/ipconfig flushdns" and then try again.
Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
Thank you for posting the entire message that helps.

Is there a firewall in place on your network?

Also, what is the result from checking your mailserver at ?

Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
You also didn't confirm if you are able to RECEIVE any email nor did you confirm if you are testing SENDING to various domains.  Please advise.

jdffAuthor Commented:
I found the problem, it was forwarding to a domain that did not allow relay.

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