553 sorry, relaying denied from your location

[sdgman500]

There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.

<mail.mydomain.com #5.5.0 smtp;553 sorry, relaying denied from your location [xx.xx.xx.xx] (#5.7.1)>



Exchange 2003 on Window 2003 platform member server

Come into work monday morning and all outgoing mail is returning this message. No messages last week, we are closed over the weekend, so I'm not sure what has changed or when it changed. Done some research and found some info on wrong outoging email address(I do have the correct one) or not authenicating to the SMTP Virtual Server(not sure about this as I'm logged in/authenciated to my W2K active Directory)!!

Any help in this exact NDR?
Thanks,
Shane

 

[Rookcr]

Have you checked to see if you have been placed on an RBL for having an open relay. Go to the following site and search on your mail servers address. It will let you know if you have been placed on an RBL.

http://www.declude.com/Articles.asp?ID=97

Antoher site I like is:

http://www.ordb.org/

If you are listed there then you are relaying mail.

Rook

 

[sdgman500]

Ok thanks. I did send ordb.org my ip so they are checking that out.

I got it working and let me tell you how. On the main property page of the internet mail service, I switched from using "Forward all mail through this connector to the following smart host" which was a SMTP server of my ISP to using "Use DNS to route to each address space on this connector".

Why would making this change affect my email? Unless my ISP's SMTP server was down(I still could ping it), you would think it would still work. I am going to check with my ISP still today...again about their SMTP server.

 

[Rookcr]

Possible your ISP's smtp server is blacklisted. By turning off the smarthost and using DNS your server is now responsible for the mail delivery rather then your ISP. Why would you use your ISP's smtp server? Is there an advantage to this?