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sorry, that address cannot accept mail from an unresolved IP address

I am trying to send email from a MS Exchange Server to a Netfirms domain but I get this error:
mx1.netfirms.com rejected your message to the following e-mail addresses:
Mario Lopez (mario.lopez@e-sigue.com)
mx1.netfirms.com gave this error:
sorry, that address cannot accept mail from an unresolved IP address
A problem occurred during the delivery of this message to this e-mail address. Try sending this message again. If the problem continues, please contact your helpdesk.
0
madios63
Asked:
madios63
1 Solution
 
phoenixfire425Commented:
you need to have a reverse lookup on your mail server.

Some servers block all message that do not have a reverse address.
0

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