Not sure I understand what you are saying but the email goes through exchange, then to barracuda, then firewall, then out to the world
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Exchange 2007 Queue Problems
All of a sudden I noticed that our Queue has been filling up with delayed messages. It is not a real lot but enough to raise concern. A few of the errors have been 400.4.4.7 Message delayed. I have a few 450.4.5.0 No recipient succeeded messages as well. It also seems as though there is a couple addresses that are kicking emails back to us.
(An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
The following organization rejected your message: )
I looked on a few of the spam sites and we are not listed on any of them. I rebooted the mail server to see if that was the problem. I also rebooted our barracuda which I didn't think was the problem. Any help is greatly appreciated.
Thanks
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Answers
it is just strange because we never had an issue before. There about 20 different domains that look to be affected. I see that Road Runner is one of the largest holding up 16 emails from 5 different users. But there is also a state agency that is not going through as well. Also I started to setup a blackberry enterprise server but havent finished it yet. That wouldn't cause these types of issues would it?
I did some research on 1 of the delayed messages and found that it may be due to not correctly configuring my reverse DNS. I am not sure how to set this up or to check to see if it is setup correctly. I have an internal Exchange server and I use Godaddy as my domain registrar. I know that i setup the MX records in godaddy for the exchange server a while back. Any help is appreciated.
Thanks
OK actually we do have a reverse DNS setup. It looks like it was completed on sept 29th of this year (just last week). It should have propagated by now. Here is an error message that we are getting when sending to one of the emails in question.
#550-** Attention ** 550-sorry, this connection has been rejected! 550-64.72.93.134 does not have an PTR record or Reverse DNS Entry. 550-This usually means that your provider wants you to send your email via 550-their servers, and not your own. 550-This is a permanent failure, Sorry things did not work out. 550-If your IP is dynamic you may contact your ISP and request a static IP 550 address. ##
Now what is weird is that everything here shows that our outside address is 64.72.93.136 including our mx records for our domain name. In our router it shows our barracuda as 134 but we do not send outgoing mail to the barracuda.
The fact that you are getting an NDR with that IP address on it indicates that they are seeing the connection coming from that IP address. That would tend to point to the NAT being wrong on the firewall.
Are you therefore saying that you are sending email on a different IP address to the one that you are receiving it on?
Simon.
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by: MesthaPosted on 2009-10-02 at 09:30:39ID: 25479479
Does your email go out directly, or through the appliance?
4.x.x messages are temporary errors, so are not unusual.
Simon.