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i have shut off all authentication methods on my current recieve connector and it doesnt seem to make a difference. &nbsp;<br />
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Why would the other persons exchange organization even be trying to offer authentication?
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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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Users sending from a external Exchange 2000 SP4 organiation are trying to send my users mail. &nbsp;They are the only ones that we cannont recieve mail from. &nbsp;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.<br />
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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].<br />
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My organization uses Exchange Server 2007 with Roll up 4<br />
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My questions are... &nbsp;Why would a external exchange server try to authenticate directy to my server in order to send mail?<br />
<br />
And...<br />
<br />
How do i fix this either internally or by contacting their IT department?
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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?

External exchange organization having trouble sending to my exchange organization.

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

A vulnerability is a weakness which allows an attacker to reduce a system's information assurance. Vulnerability is the intersection of three elements: a system susceptibility or flaw, attacker access to the flaw, and attacker capability to exploit the flaw. To exploit a vulnerability, an attacker must have at least one applicable tool or technique that can connect to a system weakness, known as the attack surface. Vulnerability management is the cyclical practice of identifying, classifying, remediating, and mitigating vulnerabilities. Other vulnerabilities include security risks, security defects and constructs in programming languages that are difficult to use properly.

Vulnerabilities

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).