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550-Callback setup failed while verifying

Since this last week I have been noticing that several external mail-accounts (three in total) are reporting the following error as inclosed below when you try to send them a message :

Reporting-MTA: dns; mail.beers.nl
Received-From-MTA: dns; pccq662 (unverified [10.18.200.150])
Arrival-Date: Mon, 13 Sep 2004 14:37:15 +0200

Final-Recipient: rfc822; auto.luxe@12move.nl
Action: failed
Status: 5.0.0 (Permanent failure - no additional status information available)
Remote-MTA: dns; mail-mx-00.tiscali.nl
Diagnostic-Code: smtp; 550-Callback setup failed while verifying <jimmy.velzen@beers.nl>
    550-(result of an earlier callout reused). 550-The initial connection, or a HELO or MAIL FROM:<>
    command was 550-rejected. Refusing MAIL FROM:<> does not help fight spam, disregards 550-RFC
    requirements, and stops you from receiving standard bounce 550-messages. This host does not
    accept mail from domains whose servers 550-refuse bounces. 550 Sender verify failed

The accounts to which the email is sent are valid accounts and can actually be reached from other external accounts.  I have received this same error from two different MTA's/ISP's. Besides the three external accounts that actually log this specific error all other external accounts are functioning just fine.
 
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ns8matrix
Asked:
ns8matrix
1 Solution
 
SembeeCommented:
First - don't forget that while there appear to be many ISPs out there, it isn't unusual for them to be sharing the same infrustructure with one of the big providers. In this case it looks like your email is being rejected by tiscali.

Have you got your server setup to reject NDR - non delivery reports? This is what Tiscali is effectively saying. Could also be a confused message with your reverse DNS not setup correctly.

Short term fix? I think an SMTP Connector for any domains that cause problems should get you going while you attempt to work out what the problem is and a longer term fix.
http://www.amset.info/exchange/smtp-connector.asp

Go to dnsreport.com and enter your domain name and see if it reports any errors.

Simon.
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ns8matrixAuthor Commented:
Thanx for pointing me to the http://dnsreport.com, after running the DNSreport test I noticed that my mailserver did not meet the RFC-requirement regarding "Acceptance of NULL <> sender". After making the neccessary changes to the mailserver all email is sent the way the doctor ordered!
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