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External exchange organization having trouble sending to my exchange organization.

Users sending from a external Exchange 2000 SP4 organiation are trying to send my users mail.  They are the only ones that we cannont recieve mail from.  And they say we are the only ones they cant send to. The event log displays this message when ever they try to send a email.

Inbound authentication failed with error LogonDenied for Recieve connector Default EXCAHNGE. The authentication mechanism is Gssapi. The source IP address of the client who tried to authenticate to Microsfot Exchange is [216.xxx.xxx.xxx].

My organization uses Exchange Server 2007 with Roll up 4

My questions are...  Why would a external exchange server try to authenticate directy to my server in order to send mail?

And...

How do i fix this either internally or by contacting their IT department?
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curwengroup
Asked:
curwengroup
1 Solution
 
mass2612Commented:
Hi,

It sounds like your recieve connector is set to require authentication. You may be able to solve this by creating a new recieve connector that does not require authentication for this domain.

How to Create a New Receive Connector
http://technet.microsoft.com/en-us/library/bb124327.aspx

http://forums.microsoft.com/TechNet/ShowPost.aspx?PostID=1509202&SiteID=17
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curwengroupAuthor Commented:
i have shut off all authentication methods on my current recieve connector and it doesnt seem to make a difference.  

Why would the other persons exchange organization even be trying to offer authentication?
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