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Having some bad mail server problems

Posted on 2014-11-13
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Last Modified: 2014-11-14
Hi guys,

Could use some help here. We've been having users complain that their email is either bouncing back to them or they get message delayed emails and finally it bounces back. I checked all the usual things like reversedns, blocklists, etc, but it continues to happen. Currently, if I look in the queue I see a few 421 4.2.1 errors and the message keep retrying. We do have two Interner connections here and the mail could go out on both, but the DNS is set up correctly.

Any help would be appreciated! I also ran the Microsoft Remote connection tests and it passed on both IP's:


      Performing Outbound SMTP Test
       The outbound SMTP test was successful.
       
      Additional Details
       
Elapsed Time: 19372 ms.
       
      Test Steps
       
      Attempting reverse DNS lookup for IP address 40.141.69.66.
       The Microsoft Connectivity Analyzer successfully resolved IP address 40.141.69.66 via reverse DNS lookup.
       
      Additional Details
      Performing Real-Time Black Hole List (RBL) Test
       Your IP address wasn't found on any of the block lists selected.
       
      Additional Details
       
      Test Steps
      Performing Sender ID validation.
       Sender ID validation was performed successfully.
       
      Additional Details
       
      Test Steps

Our mail server would be mail.orbuscompany.com

Thanks!
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Question by:OrbusLLC
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Expert Comment

by:Amit
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What is the next hop after Exchange server?
Do you have any email gateway after Exchange server?
Error clearly indicates DNS issue. Are you running Exchange on VM? If yes, check VLAN configuration also.
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Expert Comment

by:tmoore1962
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are your two internet connections in fail over or load balance.  Are the IP addresses for both ISP listed in MX record with the correct priority if they're failover?  You would also probably have to have them configured in the spf record as well for testing remove one of the internet connections (esp if not listed on mx records)
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by:Amit
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Focus on next hop, sometime ISP changes IP's without updating customer. Ask your ISP.
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Author Comment

by:OrbusLLC
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We are using Postini right now as the in between. I have all IP's in the SPF and the circuits are failover using DNS Made Easy.
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How does your email signature look on mobiles?

Do your employees use mobile devices to reply to emails? With mobile becoming increasingly important to the business world, it is in your best interest to make sure that your email signature looks great across all types of devices.

 
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by:Amit
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then focus on postini. restart postini and check again.
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by:OrbusLLC
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Postini is a spam service in the cloud provided by Google.
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by:Amit
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then call Google and tell them about this issue you are facing. Before that you can do nslookup for you Exchange server ip's as well. just to check, if DNS records for Exchange server exist properly or not.
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by:OrbusLLC
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Looks like it has to do with our Sonicwall and DNS. I have the DNS record set for 40.141.69.67, but the mailserver is showing the IP as 40.141.69.66 which is causing issues. Can someone guide me into making the correct NAT entry on the Sonicwall?
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Amit earned 500 total points
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As I said it is a DNS issue. I also mentioned to focus on next hop, which is Sonicwall in your case. For sonic wall create a new question.
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