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Problems with exchange 2007 : status 550

Posted on 2008-06-15
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Last Modified: 2012-08-13
Hi guys,

I have exchange 2007 on server 2003
I can send/receive emails but when I do a dnscheck, it gives me this result

 Domain www.com.sg has only one mail-server  
  Checking mail server (PRI=30) www.com.sg [116.12.179.37]  
  Mail server www.com.sg[IP address] answers on port 25  
  <<< 220 webmail.www.com.sg Microsoft ESMTP MAIL Service ready at Mon, 16 Jun 2008 12:56:59 +0800
  >>> HELO www.checkdns.net 
  <<< 250 webmail.www.com.sg Hello [195.60.98.252]
  >>> MAIL FROM: <dnscheck@uniplace.com>
  <<< 250 2.1.0 Sender OK
  >>> RCPT TO: <postmaster@www.com.sg>
  <<< 550 5.1.1 User unknown
  >>> RCPT TO: <root@www.com.sg>
  <<< 550 5.1.1 User unknown
  >>> RCPT TO: <info@www.com.sg>
  <<< 550 5.1.1 User unknown
  >>> RCPT TO: <webmaster@www.com.sg>
  <<< 550 5.1.1 User unknown
  Probably mail server does not accept mail for www.com.sg (received status 550)  
  Some of your MX do not work properly  
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Question by:moneywell
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Expert Comment

by:kieran_b
ID: 21791099
Do any of those email addresses exist?

webmaster/root/postmaster/info?
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Author Comment

by:moneywell
ID: 21791131
nope
is that the problem?
cause i can receive all email.
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Accepted Solution

by:
kieran_b earned 200 total points
ID: 21791601
Yes, that is the whole problem.

It is testing "common" email addresses - if you don't have any of them (and to be honest, the only one you should have is postmaster) then there is nothing to worry about.

It is as if I said, "I tried to email sadhaksuyd8as7d89u2@yourdomain.com and it bounced" - the question is, would you care?  'cause you shouldn't.
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Author Closing Comment

by:moneywell
ID: 31467475
Thanks a lot.
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