Question : The recipient was unavailable to take delivery of the message

Hi. I keep on getting this error whenever i send email "The recipient was unavailable to take delivery of the message". Although its selective some sites get my email some doesn't. I'm running Windows NT with exchange 5.5. All are updated using the last service packs. I'm not too sure if this is a virus or i am blacklisted because if i change the Static IP the mail goes through. Hope you can help.

Thanks

Answer : The recipient was unavailable to take delivery of the message

You are still currently listed on 4 blacklists

http://www.mxtoolbox.com/SuperTool.aspx?action=blacklist%3a119.111.184.35

Checking the CBL list shows the last time it got spam from you was 3½ days ago, so the problem looks as though it has been resolved, but you need to get removed from the blacklists.

IP Address 119.111.184.35 is currently listed in the CBL.
It was detected at 2009-11-06 09:00 GMT (+/- 30 minutes), approximately 3 days, 11 hours, 29 minutes ago.

Have you requested to be removed from the listings?  It won't happen automatically (not quickly anyway).

Did you find an infected machine or two?

Click on the first link and then on the links from that page to the relevant blocklist sites and request de-listing.  After a few hours (if you are lucky), you will drop off the lists and hopefully should be able to send out mail to all again.