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

Posted on 2012-04-03
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Last Modified: 2012-04-04
I have a lot of servers delaying my outbound messages:
554 "host.domain.com" attempted failover to alternate host, bit that did not succeed...
554 Unfortunately your access to this mail system has been rejeted due to the sending MTA's poor IP reputation

This is starting to cause some major email issues and I need to know how to troubleshoot and resolve.

I'm not blacklisted, at least not yet
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Question by:Snyper82
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37801345
Please check your Reputation on www.senderbase.org and see if it is poor.  If it is, it will improve over time, but not in the next few days.
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Author Comment

by:Snyper82
ID: 37801358
It is, I've checked there already.

Any way to speed up the process?  This is killing business.
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37801375
Configure your SEND Connector to use a SMARTHOST (your ISP's Mail server) for now instead of direct via DNS and your mail should flow a bit better (it may not be perfect as it depends on your ISP and their reputation / blacklistings).
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Author Comment

by:Snyper82
ID: 37801419
My ISP is a fiber company, no mail servers.
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37801430
That's not very helpful of them.

Then unless you can find / pay for a Smarthost in the mean-time, you are a little bit snookered.
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Author Comment

by:Snyper82
ID: 37801604
ok, so what would cause a bad reputation?
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37801674
If you are a new server using an IP address that hasn't sent mail before and thus there is no history of your being a good / bad / indifferent mail server.

Once you have established a pattern of good (not being reported for spam) behaviour, you should be fine.  Sadly - that is just a waiting game and usually is in the weeks not days time frame.
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Author Comment

by:Snyper82
ID: 37802033
We've been around for years.  Using this IP for 2 years.

I added another server but everything sends out via old sever via normal IP address

This doesn't make any sense
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37802043
Can you divulge your IP / domain name, either here or in an email to alan @ it-eye.co.uk.  If you divulge it here, I can hide it for you.

Alan
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Author Comment

by:Snyper82
ID: 37802061
I can send the headers of an email I sent to my personal address if it would help.
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LVL 76

Accepted Solution

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Alan Hardisty earned 500 total points
ID: 37802121
Thanks.

Your reverse DNS is not configured properly on the IP Address 74.xxx.xxx.141

If you visit http://www.blacklistalert.org/ and enter your IP - you will see what is showing.  This should be set as pscwebmail.yourdomain.com.  You will need to talk to your ISP to get this changed.  That should help your mail-flow problems as people will reject you if Reverse DNS isn't configured properly.
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Author Comment

by:Snyper82
ID: 37802131
ok, should it be my public dns name pscweb.domain.com or my internal server.domain.com?
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37802172
Your Public name.
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Author Closing Comment

by:Snyper82
ID: 37805882
Perfect, this has already brought us up to neutral!
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LVL 76

Expert Comment

by:Alan Hardisty
ID: 37805906
Happy days :)

Glad your mail is now flowing more smoothly and thanks for the points.

Alan
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