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Highly Urgent - mail server not found for some clients
| Posted by anastasia0181, 03-05-2010, 05:53 AM |
| Hi,
I moved my server and changed its DNS 2 days ago, but today I have some clients complaining about not receiving mails in their outlook.
am able to acces their mails. So it works fine for some and some not, these clients are able to see their web sites but not able to access their outlook messages. even the configuretion is correct, The error they get is unable to find the mail server.
I synchronised the DNS to all server but still not working for them.
I have a Centos server with WHM.
Please what should I fo?
Thank you
|
| Posted by madaboutlinux, 03-05-2010, 06:07 AM |
| It looks like mail.domain.tld is not resolving to the new server from their ISP. Make sure 'mail' records in the DNS zones are correct and you can ask your clients to use the new server IP as SMTP and POP3 servers in Outlook instead of mail.domain.tld.
|
| Posted by jweeb, 03-05-2010, 06:12 AM |
| what kind of errors did they get?
|
| Posted by anastasia0181, 03-05-2010, 07:39 AM |
| Hi,
1- On outlook, they get:
unable to connect to outgoing mail server.
2- From WHM/mail queue manager, I get the error while delivering a message:
451 4.1.8 xxx.xx Domain of sender address does not resolve
Thank you
|
| Posted by Johnny Cache, 03-05-2010, 08:26 AM |
| My guess is that there's an incorrect MX record stuck in some of your customer's DNS zones.
Another thing you could have your customers try is simply to use their domain name as their POP/SMTP servers in their mail program. By default, I believe that's how WHM sets up the zone's MX record when a new domain is added.
Oh, another theory- perhaps resolv.conf has your old IP's listed?
Also, did you buy a new cPanel server or did you relocate the same one? If you bought a new server and migrated your customers via cpMove or restored your clients using cPanel backups that were made on the old server, odds are their DNS zones are full of incorrect IPs/hosts. I believe the synchronizing DNS feature only works if you're operating a cluster.
Just a thought - good luck!
|
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