Go Premium for a chance to win a PS4. Enter to Win

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 217
  • Last Modified:

Exchange 2003/ISA server

We've just updated our network settings and everything is working ok apart from now we can't send or receive emails.

RDP is working and telnet on port 25 is getting a response from the server.

The network change was the IPs on the external network connection of the server as we've moved ISP. We updated the forwarders in DNS and have also updated the SMTP relay allow list within Exchange.

When trying to send email we receive an Undeliverable message from the exchange server saying Recipient address rejected: Relay access denied. Test emails sent in never arrive.

Incoming email is passed through an external SPAM service and the delivery IP was updated on the control panel and the test from there says that it's working ok.

Any help greatly appreciated as we can't seem to track down the issue but believe it either to be something missed in Exchange or something we've overlooked in ISA server.

Thanks.
0
Plaice
Asked:
Plaice
  • 8
  • 7
3 Solutions
 
Glen KnightCommented:
With receiving have you updated the A record that your MX record points to?

Goto http://www.mxtoolbox.com and check to see where it thinks mail should be going.  It can take a few hours and up to 48 hours for the records to update.
0
 
PlaiceAuthor Commented:
MX record points to the external SPAM service so that remains the same. Delivery IP from that service has been changed to the new external IP.
0
 
Glen KnightCommented:
and there are no restrictions on the router/firewall for the IP address? Relay restrictions on the Default SMTP Virtual Server in Exchange?
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
PlaiceAuthor Commented:
No restrictions on the hardware firewall that is handling the external connection. Can see no restrictions within ISA server.

No relay restrictions within SMTP Virtual Server at all.
0
 
Glen KnightCommented:
Have you updated the IP addresses in ISA?
0
 
PlaiceAuthor Commented:
As far as we could see there were no IP addresses to update within ISA server. The internal network remain the same and the external has no IP defined.
0
 
Glen KnightCommented:
OK, so from inside your network goto http://whatsmyip.org

Get your external IP address, from outside of your network can you telnet to that IP address on port 25?

What happens?
0
 
Suliman Abu KharroubIT Consultant Commented:
Are you publish SMTP service throw ISA ?
0
 
PlaiceAuthor Commented:
Get back the message:

220 <domain> Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at current date and time.
0
 
Glen KnightCommented:
Can you do a telnet test and send yourself an email: http://support.microsoft.com/kb/153119

If that works then they have got the wrong IP on the SPAM service or it hasn't updated yet.
0
 
PlaiceAuthor Commented:
Well got all the right responses from following through the MS document and the email was received.
0
 
PlaiceAuthor Commented:
But the relay error we're getting when trying to send is being generated by our Exchange server.
0
 
Glen KnightCommented:
you have just proven that your Exchange Server is not at fault.

0
 
PlaiceAuthor Commented:
So could it be ISA server?

Aplogies for not responding earlier Sulimanw:

No we don't publish there is just an access rule on ISA.
0
 
Glen KnightCommented:
If you have an access rule then ISA is out of the equation, it will just be sending port 25 to your exchange server.
Again, you hae proven that there is nothing wrong with your config.

0
 
PlaiceAuthor Commented:
Great help with the analysis of issue by Demazter.
0

Featured Post

Simplify Active Directory Administration

Administration of Active Directory does not have to be hard.  Too often what should be a simple task is made more difficult than it needs to be.The solution?  Hyena from SystemTools Software.  With ease-of-use as well as powerful importing and bulk updating capabilities.

  • 8
  • 7
Tackle projects and never again get stuck behind a technical roadblock.
Join Now