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Exchange Mail Server - MTA poor reputation? Not on blacklists. Just set up PTR

I have suddenly encountered a problem where the mail from my exchange server is being rejected due to poor reputation. The server is at exchange.healthone.com.au

The server/IP does not appear on any black lists and all seems ok.

Until 24 hours ago, I did not have Reverse DNS set up, but this has never been a problem before. I now have the Reverse DNS (PTR) record in place, but this does not seem to be helping.

Any ideas?
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subversivetech
Asked:
subversivetech
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1 Solution
 
Alan HardistyCommented:
What is showing you as having a poor reputation?

I can't see anywhere that would dislike you.  You seem to be RFC compliant.

What is the FQDN on your SEND Connector showing as?  It should be exchange.healthone.com.au
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subversivetechAuthor Commented:
Send connector FQDN: exchange.healthone.com.au
'
Most mail servers are just hanging up on me, others are giving an explanation:

From protocol logs:

2011-03-08T00:00:02.407Z,Internet,08CDAB38E34629CE,2,10.1.1.13:24658,203.0.178.180:25,<,554-inbound.icp-qv1-irony-in5.iinet.net.au,
2011-03-08T00:00:02.407Z,Internet,08CDAB38E34629CE,3,10.1.1.13:24658,203.0.178.180:25,<,"554 Your access to this mail system from 59.167.138.240 has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.",
2011-03-08T00:00:02.407Z,Internet,08CDAB38E34629CE,4,10.1.1.13:24658,203.0.178.180:25,>,QUIT,
2011-03-08T00:00:02.408Z,Internet,08CDAB38E34629CE,5,10.1.1.13:24658,203.0.178.180:25,-,,Remote
2011-03-08T00:00:04.504Z,Internet,08CDAB38E34629CD,1,10.1.1.13:24657,203.43.124.143:25,+,,
2011-03-08T00:00:04.574Z,Internet,08CDAB38E34629CD,2,10.1.1.13:24657,203.43.124.143:25,<,554 mail3.signet.com.au,
2011-03-08T00:00:04.575Z,Internet,08CDAB38E34629CD,3,10.1.1.13:24657,203.43.124.143:25,>,QUIT,
2011-03-08T00:00:04.575Z,Internet,08CDAB38E34629CD,4,10.1.1.13:24657,203.43.124.143:25,-,,Remote
2011-03-08T00:00:20.682Z,Internet,08CDAB38E34629D1,0,,139.163.137.11:25,*,,attempting to connect
2011-03-08T00:00:20.704Z,Internet,08CDAB38E34629D1,1,10.1.1.13:24669,139.163.137.11:25,+,,

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subversivetechAuthor Commented:
Why is my server being bullied by the other kids?
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Alan HardistyCommented:
I would contact the recipient IT people and ask them to explain why they think you have a poor reputation as I can't find anywhere (like you), that shows you have a poor reputation.

They may be using some random reputation checking service that is incorrectly listing you.
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subversivetechAuthor Commented:
Looking at some of those links that there is more to having a good reputation than simply not being on a blacklist. I will be investigating some kind of monitoring to get ongoing reports on reputation.

However, I have noticed today that the mail servers that were bouncing my mail have stopped doing so. Perhaps the change I made recently (setting up Reverse DNS ptr record) is having a positive effect, or perhaps the reputation score for the server is climbing back up again.
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Alan HardistyCommented:
Your Reverse DNS record (lack of) will make a huge difference and is a major factor in getting rejected.
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