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returning emails (Submission from dynamic IP requires authentication)

Posted on 2014-02-23
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Last Modified: 2014-12-11
Dear experts,

We have an small domain network with Exchange 2010 server.
Our ISP told us we must leave automatic obtain IP on routers WAN interface, there is a reservation and we always get our IP address (we pay static IP).

When our exployees send emails, they sometimes get it back with error:
mx2.freenet.de #550 Submission from dynamic IP 123.123.123.123 requires authentication ##

123.123.123.123 is our IP
mx2.freenet.de is recipients mailserver.

Any suggestions?


Regards,
Jarda
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Question by:JardaCZ
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Simon Butler (Sembee) earned 500 total points
ID: 39880764
This is a problem with the recipient's system, nothing you can do about it.
Is the host mentioned also provided by your ISP? If so it could be that it is getting confused and seeing the email as coming from on network, when it should be treated as off-network because you are running your own email server.
The recipient needs to resolve this issue, there is little that you can do.

Simon.
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