SMTP error message

Matthew Galiano
Matthew Galiano used Ask the Experts™
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I have a Server 2003 Standard Edition, and its running Exchange 2003. AD is on another server as the DC, DNS, and DHCP. One of my users is trying to send an email to someone and getting this error message.

server name #5.7.1 smtp;554 5.7.1 DXNS3 167.206.184.226: Message refused. Your host name dosen't match with your IP address: server name
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Expert of the Year 2007
Expert of the Year 2006

Commented:
That means either your server hasn't got a reverse DNS record and/or your server isn't announcing itself correctly.

Reverse DNS is configured by your ISP.

Put your domain in to dnsreport.com and see whether it flags anything in the mail server section.

Simon.

Author

Commented:
I ran that report like you asked, the only thing that comes up in the mail section is this:

Mail server host name in greeting

WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

mail.image-specialists.com claims to be invalid hostname '**************************************************0****0****0':
   220 **************************************************0****0****0 *********************200*****0******0*00
Expert of the Year 2007
Expert of the Year 2006

Commented:
You have a PIX.
Turn off fixup SMTP in the PIX configuration. Then run the test again.

Simon.
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Commented:
WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server. Note that this one test may use a cached DNS record.

mail.image-specialists.com claims to be invalid hostname 'IMAGEAPP':
   220 IMAGEAPP Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at Wed, 6 Jun 2007 15:20:17 -0400


THis is what its stating now, i made the change and i get more. I'm also getting an HELO errors as well. I tried some different solutions but its not working. I think the problem is whoever is hosting the records, but not sure. Any other suggestions would be appreciated, thank you.

Your mail system could not find a way to successfully communicate with the destination system. Please notify your administrator.

            <Servername #5.5.2 smtp;504 5.5.2 <Servername>: Helo command rejected: need fully-qualified hostname>
Expert of the Year 2007
Expert of the Year 2006
Commented:
That is a common error.
Your server is announcing itself as an invalid name.
You need to change it.

ESM, Servers, <your server>, Protocols, SMTP. Right click on the default SMTP VS and choose Properties. Click on the tab Delivery and then Advanced. In the box FQDN enter mail.image-specialists.com
Then apply/OK out.

Simon.

Author

Commented:
I made the change, i'm going to have them try it tomorrow. I'll let you know, thank you for your help.
Worked for me!

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