Message not leaving the Queue in Exchange 2003

Morning,

Out going mail have stopped working - the mesages are not leaving the exchange server.

Our mailserver is mail.wisemanlee.co.uk 77.73.11.54

The SMTP Diagnostics at MXtoolbox all show ok apart from the Reverse DNS FAILED

Our web site moved to a new server last Thursday and wiseman.co.uk and wisemanlee.co.uk should now be at www      A       135.196.251.167 - But not sure how to check or if this is causing a problem

No error's in Event log

I can connect to the server via port 25 and send myself a test email using the EHLO commands etc...

Stumped now...

Please help 500 points...
Ian PriceIT ManagerAsked:
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dan_blagutConnect With a Mentor Commented:
If your DNS is hosted to ISP yes.
Can you connect an computer to internet by modem, wifi or other, but no your ISP? If yes use nslookup to see what the DNS say about you. Then install an SMTP server and try to contact this server from your exchange server using telnet ip 25

Dan
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dan_blagutCommented:
Hello

The SMTP server use DNS for connecting to extern servers if you don't use front servers. So please confirm that you can browse internet from your server.

Dan
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Ian PriceIT ManagerAuthor Commented:
Yep we can browse the internet no problem at all....
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dan_blagutCommented:
Check on the smtp connector properties, general page if you have use DNS to send messages.

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Ian PriceIT ManagerAuthor Commented:
Would be Administrative Groups | First Administrative Groups | SMTP | Default SMTP Virtual Server| Properties | Delivery Tab | Advanced Delivery | Configure external DNS Servers |

This section wasn't using the external DNS - but is now I have stopped and started the MTA server messages still sitting in the Q...
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dan_blagutCommented:
I don't think so. There you will configure the server used for revers DNS on incoming message.
What i asked is in
Administrative Groups | First Administrative Groups |Routing group |First routing group | connectors ...
Sorry if is not exactly the same, but I have a french console.

DaN
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dan_blagutCommented:
The missing DNS server from Administrative Groups | First Administrative Groups | SMTP | Default SMTP Virtual Server| Properties | Delivery Tab | Advanced Delivery | Configure external DNS Servers |
is responsable for the Reverse DNS FAILED in my opinion.
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Ian PriceIT ManagerAuthor Commented:
Ok got it - yes it does use DNS to send messages...

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dan_blagutCommented:
There is no filtering on the port 25?
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dan_blagutCommented:
Anyway if you click one queue you have an message on bottom. What it says?
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Ian PriceIT ManagerAuthor Commented:
Ok...

Three different messages appear on different emails in the Q

The connection was dropped due to an SMTP protocol event sink.
An SMTP protocol error occurred
The connection was dropped by the remote host

No filtering on port 25 at all it goes straight out..
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dan_blagutCommented:
It's look's like your router kill the communication in the midle, or your new Ip is blacklisted as spam provider. Try www.dnsstuff.com to see if you are listed.
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Ian PriceIT ManagerAuthor Commented:
So the messages are leaving our system as such just getting killed or blacked listed up stream ?

How do I check the blacklist on DNStuff ?

Ian
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dan_blagutCommented:
No the comm is killed before, at the connection time.
in the dnsstuff.com you type your domain in the FREE Domain Health Check  section then wait until the test is finished. In the result you have 2 section: one with the problems on your DNS and other with blacklisting. The seccond must be 0
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Ian PriceIT ManagerAuthor Commented:
It shows that I have 3 DNS failures - but 0 blacklist.

I guess we have to pay for the DNS report - it's likey to be a ISP problem if the DNS is screwed ?
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Ian PriceIT ManagerAuthor Commented:
Yep DNS is hosted by ISP -

They have sorted the DNS and MX records now all OK

Got any other idea's

Ian
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dan_blagutCommented:
try to look on this.
http://technet.microsoft.com/en-us/library/aa996805.aspx
and also can you look on the event log (system).

Dan
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dan_blagutCommented:
Well? It's working?
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