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Check if this helps<br />
<a href="http://www.rackaid.com/resources/how-to-remove-your-email-server-from-yahoos-blacklist/" rel="ugc">http://www.rackaid.com/resources/how-to-remove-your-email-server-from-yahoos-blacklist/</a><br />
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You might need to wait for 3 days for the change to be replicate globally
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Check if this helps
http://www.rackaid.com/resources/how-to-remove-your-email-server-from-yahoos-blacklist/ [http://www.rackaid.com/resources/how-to-remove-your-email-server-from-yahoos-blacklist/]

You might need to wait for 3 days for the change to be replicate globally

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As an alternative, if you have a second public IP you can use, switch to it. &nbsp;If not a static IP but dynamic, changing the MAC address of the WAN router connection will force a different IP, though not always the best practice in case you duplicate a real MAC.
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As an alternative, if you have a second public IP you can use, switch to it.  If not a static IP but dynamic, changing the MAC address of the WAN router connection will force a different IP, though not always the best practice in case you duplicate a real MAC.

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Yea I will keep that in mind for the future. Althought it looks like changing all the passwords fixed the issue as some user must have had their account hijacked.
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Yea I will keep that in mind for the future. Althought it looks like changing all the passwords fixed the issue as some user must have had their account hijacked.

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our exchange 2003 server was recently higjacked and sending out tons of spam. I fixed all the filters and changed all the user passwords so the mail queues are once again normal. But, I am still not able to send emails to certain domains one of them being yahoo.com so i think we are on their blacklist. I cannot find the exact form on yahoo's site to request removal from their blacklist. I have checked all the blacklist checkers out there and our domain is on none of them. can someone help me out?<br />
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thanks
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our exchange 2003 server was recently higjacked and sending out tons of spam. I fixed all the filters and changed all the user passwords so the mail queues are once again normal. But, I am still not able to send emails to certain domains one of them being yahoo.com so i think we are on their blacklist. I cannot find the exact form on yahoo's site to request removal from their blacklist. I have checked all the blacklist checkers out there and our domain is on none of them. can someone help me out?

thanks

Exchange 2003 Removal From Yahoo BlackList

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.