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Often that's because DNS-BL lists have blacklisted your IP address. &nbsp;This might not be your fault, or perhaps your server is connected to a set of IP addresses considered dialup or public (home cable modems, for example). &nbsp;Try a site like this to see if that's the problem:<br />
<br />
<a href="http://www.mxtoolbox.com/blacklists.aspx" rel="ugc">http://www.mxtoolbox.com/blacklists.aspx</a>
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Often that's because DNS-BL lists have blacklisted your IP address.  This might not be your fault, or perhaps your server is connected to a set of IP addresses considered dialup or public (home cable modems, for example).  Try a site like this to see if that's the problem:

http://www.mxtoolbox.com/blacklists.aspx [http://www.mxtoolbox.com/blacklists.aspx]

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email are delivering after 5-10 hrs not completly blocked
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email are delivering after 5-10 hrs not completly blocked

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I am having email delivery issue, it takes around 5-10 hours to delivery email. sometime it returns this error<br />
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&quot;&nbsp;Remote host said: 550 5.7.1 Requested action not taken: message refused &nbsp;&quot;<br />
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it looks this problem is only with domain email 
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I am having email delivery issue, it takes around 5-10 hours to delivery email. sometime it returns this error

" Remote host said: 550 5.7.1 Requested action not taken: message refused  "

it looks this problem is only with domain email 

Delay in email delivey

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).

Windows Server 2003

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

Microsoft Outlook is a personal information manager from Microsoft, available as a part of the Microsoft Office suite. Although often used mainly as an email application, it also includes a calendar, task manager, contact manager, note-taker, journal, and web browser.