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Mail Queue Building: 451-4.4.0 and 554-host.domain.com errors

Posted on 2013-06-24
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Last Modified: 2013-06-25
Hello All,

having a few issues after a recent virus/malware outbreak last week.  I have removed the threat since the outbreak, and verified the public IP has been delisted from all the sites, but now I am still having stuck mail in queue, referencing 451-4.4.0.  

Anyone know a quick fix?

1. I have been to http://www.senderbase.org/ and found out my rating is "poor"
-How do I get my rating up in a day?

2. I went to http://www.blacklistalert.org/ and this is the info. that was given; Reverse DNS (PTR) exists and claims to be: mail.imgps.com.


Forward DNS for mail.imgps.com is: 127.0.0.2.


WARNING: Forward-DNS does NOT match Reverse-DNS.
DNS is INCONSISTENT.

-How do I resolve this issue?

This is only occurring on a selective few emails..and I really need to have this resolved ASAP!

Exchange Server : 2007
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Question by:Coupee46
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Alan Hardisty earned 500 total points
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You can't improve your senderbase.org score in a day - it takes about a month, so no point worrying about that unfortunately.

For the few problem domains, you can setup a new SEND Connector and add the domains with problems to that connector and then add a SMARTHOST address to the connector to send all mail via the smarthost for those domains.

http://technet.microsoft.com/en-us/library/aa998662(v=exchg.80).aspx

That way most of your mail will go via DNS, but the problem domains can use your smarthost.  You should call your ISP and ask them for details of their SMARTHOST and then configure that.

Alan
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by:Coupee46
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Alan,

Thank you.. i will call my ISP today.  

I called ISP and they provided me their smarthost info.  I just noticed between last night and this morning there is now 6 more new domains that are being delayed.  In an effort to reroute these emails ASAP, I just added the smarthost to the current Send Connector.

Now my question is... what is the advantage of using Public IP rather than Smarthost?  If using a smarthost alleviate my downtime from a worm/virus attack.. then I can kiss public IP goodbye? BUt i jsut wanted to make sure I am not missing anything important when using a public IP as oppose to smart host?
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