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Getting error 550 when sending mail to me.

2 of my customers have had intermittant problems sending emails to my domain. Customer 1 had the problem for several months. It was working fine before the problem occured. The problem then went away a couple of months ago. I never found the root of the problem.

Now another customer cant send me emails. They get a Error 550 verification failed. When trying to email me.

I have looed at other similar posts on EE, but have been unable to get to the bottom of my problem.

Any suggestons?

Thanks
Ed
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roy_batty
Asked:
roy_batty
1 Solution
 
florin_sCommented:
Hi,

here are some NDR's, you can try to set up SMTP logging:

http://www.computerperformance.co.uk/exchange2003/exchange2003_NDR.htm
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gupnitCommented:
Hi,
Can you explain your NDR in detail. Also something about your setup
Thanks
Nitin
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roy_battyAuthor Commented:
The customers exchange server is running as part of sbs2003.

This is the message I am getting

Your message did not reach some or all of the intended recipients.

Subject: test
Sent: 2/16/2009 1:15 PM

The following recipient(s) could not be reached:

  me@mydomain.co.uk on 2/16/2009 1:15 PM
  There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
  <mycustomer.co.uk #5.5.0 smtp;550-Verification failed for <Administrator@mycustomer.co.uk>>
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MesthaCommented:
How do you receive email? Directly or via another host? I have seen this error with 123-reg.co.uk systems in the past.

-M
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roy_battyAuthor Commented:
I receive mail via another host. I use www.rochenhost.com.
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MesthaCommented:
You need to speak to your host. They are doing some kind of call back I expect to verify the sender is valid.

-M
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roy_battyAuthor Commented:
I have contacted my host and the issue is because the senders server does not support call back. Like you said.

They can add the senders IP Address to a white list for me. I suppose alternatively I can see if the server will support call back, but thats another question.

Thanks for the help guys.
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