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Is this happening for all emails or only when emailing a particular recipient? is internal email working fine(shouldn't matter but still..)
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Is this happening for all emails or only when emailing a particular recipient? is internal email working fine(shouldn't matter but still..)

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getting delivery failure message: &nbsp;554 5.4.6 Too many hops. &nbsp;domain and ip address has been added to whitelist. &nbsp;Barracuda spam filter is being used. &nbsp;Reverse DNS look up is not enabled. &nbsp;Any ideas?
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getting delivery failure message:  554 5.4.6 Too many hops.  domain and ip address has been added to whitelist.  Barracuda spam filter is being used.  Reverse DNS look up is not enabled.  Any ideas?

delivery failure on emails to exchange server

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.

Microsoft IIS Web Server

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.