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The fact that you are are off the blacklists doesn't mean you will get email delivered to all places. A lot of systems will cache blacklist list results. Therefore it can be some time before email can be delivered reliably. If you must send email to those domains, setup an SMTP Connector with a smart host, using your ISPs SMTP server as the smart host to get the email out. <br />
<br />
Simon.
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The fact that you are are off the blacklists doesn't mean you will get email delivered to all places. A lot of systems will cache blacklist list results. Therefore it can be some time before email can be delivered reliably. If you must send email to those domains, setup an SMTP Connector with a smart host, using your ISPs SMTP server as the smart host to get the email out.

Simon.

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Quick to respond. Gave the best possible answer with the information provided.
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Quick to respond. Gave the best possible answer with the information provided.

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Server Type: Server 2003 STD SP2<br />
Exchange 2003<br />
We Use ZoneEdit &nbsp;<br />
<br />
Recently we were attacked by hacked mail servers. we got blacklisted at 3 different places tier 1. it has been about 2 days that we are no longer listed and everything has been resumed back to normal. <br />
<br />
Except that some messages from some domain are stuck in my queue and are stuck on retry<br />
highlighting &nbsp;that folder allows me to see a message that states smtp protocol error <br />
<br />
another folder states connection was dropped by remote host <br />
<br />
no changes where made to the configurations on the server <br />
<br />
Most emails are being sent with out a problem.
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Server Type: Server 2003 STD SP2
Exchange 2003
We Use ZoneEdit  

Recently we were attacked by hacked mail servers. we got blacklisted at 3 different places tier 1. it has been about 2 days that we are no longer listed and everything has been resumed back to normal. 

Except that some messages from some domain are stuck in my queue and are stuck on retry
highlighting  that folder allows me to see a message that states smtp protocol error 

another folder states connection was dropped by remote host 

no changes where made to the configurations on the server 

Most emails are being sent with out a problem.

AN SMTP protocol error occured

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.

Email Clients

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.