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

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
Snyper82Asked:
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Alan HardistyCo-OwnerCommented:
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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Alan HardistyCo-OwnerCommented:
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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Snyper82Author Commented:
It is, I've checked there already.

Any way to speed up the process?  This is killing business.
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Alan HardistyCo-OwnerCommented:
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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Snyper82Author Commented:
My ISP is a fiber company, no mail servers.
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Alan HardistyCo-OwnerCommented:
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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Snyper82Author Commented:
ok, so what would cause a bad reputation?
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Alan HardistyCo-OwnerCommented:
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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Snyper82Author Commented:
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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Alan HardistyCo-OwnerCommented:
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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Snyper82Author Commented:
I can send the headers of an email I sent to my personal address if it would help.
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Snyper82Author Commented:
ok, should it be my public dns name pscweb.domain.com or my internal server.domain.com?
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Alan HardistyCo-OwnerCommented:
Your Public name.
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Snyper82Author Commented:
Perfect, this has already brought us up to neutral!
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Alan HardistyCo-OwnerCommented:
Happy days :)

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

Alan
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