| Need help for MX records [message #57329] |
Wed, 29 October 2008 16:52  |
echo
Messages: 2
Registered: April 2008
Location: World
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Hi, i am running KMS and KWF as a mail relay and now i have 2 ISP with different public ip, when link on ISP1 is down and then kwf change to ISP2 (failover).
My question how to setup MX record with multiple IP's for one mail server?
Thanks
[Updated on: Wed, 29 October 2008 17:15] Report message to a moderator |
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| Re: Need help for MX records [message #57334 is a reply to message #57329] |
Wed, 29 October 2008 17:32  |
roly
Messages: 1
Registered: January 2006
Location: switzerland
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hi echo
mail.yourdomain.xxx = preference 0
(main kms)ip-adress isp1
failover.yourdomain.xxx = preference 20 or higher
(failover)ip-adress isp2
is that what you need to know?
by from ch, roly
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| Re: Need help for MX records [message #57352 is a reply to message #57329] |
Thu, 30 October 2008 00:56 |
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bigmountain
Messages: 64
Registered: April 2006
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Just as mentioned in the previous reply, you will need to create a domain name for each IP address. For example, if you currently are using mailserver.com for your server name, then you can keep mailserver.com, but also create a subdomain of mx2.mailserver.com and point that to the second IP address. You will need to setup both IP addresses in your server and make sure that your Kerio is setup to listen at both IPs and not just one of them.
Then, for your domain or any other domain you host mail for, you will specify two MX records with your main mailserver.com as being the primary with a higher precedence. Does that make sense? I just want to make sure I am explaining correctly. If you are using any external firewalls or spam filters, then that may change things a bit, but you didn't mention any, so I am guessing that you have a simple internet to server connection. Thanks!
Preferred Kerio Partner and Cloud Solutions Provider - Offering both shared and dedicated Kerio Connect hosting solutions.
Visit us at http://bigmountainmail.com
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| Re: Need help for MX records [message #57376 is a reply to message #57365] |
Thu, 30 October 2008 20:54 |
Nixs
Messages: 2
Registered: November 2006
Location: n
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First, the above solutions are better than mine - just presenting an alternative solution;
You can always use service like DynDNS.com to handle this.
Just because your e-mail is <_a.t_>domain.com doesn't mean your MX records have to be, so you don't have to move your <_a.t_>domain.com to DynDNS.com either.
For example, register mydomainmailserver.com with Network Solutions or whoever.
Then have your server run DynDNS client (I run this on one of mine in a similar situation) and have it dynamically update the MX record;
http://www.dyndns.com/services/dns/dyndns/
That way your DNS MX record will only point to your primary IP address. It will point to your secondary one only in the event of failure.
RFC for MX record states MX records are not to be cached and are to be looked up each connection. This isn't always done by everyone. Checkpoint is an example. If that's a concern then you could use mailhop to get around both these issues; http://www.dyndns.com/services/mailhop/ or http://www.lanechange.net/html/email_defense.shtml
These are very cheap solutions. I've used DynDNS for years and have never paid a penny (though I don't do MX.) I've used Lanechange in the past for years and they had excellent service for very low price.
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| Re: Need help for MX records [message #57439 is a reply to message #57334] |
Sun, 02 November 2008 03:43 |
echo
Messages: 2
Registered: April 2008
Location: World
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| roly wrote on Thu, 30 October 2008 00:32 |
hi echo
mail.yourdomain.xxx = preference 0
(main kms)ip-adress isp1
failover.yourdomain.xxx = preference 20 or higher
(failover)ip-adress isp2
is that what you need to know?
by from ch, roly
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So on local dns i should make cname record since my mail server is one?
Is`t right?
Thanks
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| Re: Need help for MX records [message #57450 is a reply to message #57329] |
Sun, 02 November 2008 13:39 |
generic_penguin
Messages: 22
Registered: November 2008
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I think you are making this harder than you need to
All this should be done on your external DNS, Normally this can be edited by you and is either part of your ISP's solution, Domain name register service, or your web hosting supplier
Either way
Lets say your primary mail server is at 202.1.1.1 (Insert valid external IP here)
Lets say this IP 202.1.1.1's dns is mail.company.com
Lets say your secondary mail server is at 203.1.1.1 (Insert valid external IP here)
Lets say this IP 203.1.1.1's dns is mail2.company.com
Then your external DNS will may a MX10 of mail.company.com and an MX20 of mail2.company.com, your ISP may even supply a mail relay for you and this could be MX30 etc..
The mail server at 202.1.1.1 and 203.1.1.1 will accept email for company.com and will have a valid SSL certificate on them for either mail.company.com or mail2.company.com
As for your internal DNS inside your network you will always point your mail clients to the primary mail server. If you want to make life easy have them all point to mail.company.com and have your internal DNS resolve this to the internal IP of the mai server (EG 10.1.1.1) This way your end users will not have to change the mail server entry when in the office to out of the office and all traffic will be local when in the office.
Kerio does not support mail clustering at this time so no need for round robin DNS or multiple MX records internal or load balancing switches. (Well unless you are doing really funky stuff)
Mind you I would love Kerio to support mail clustering, Then we could host the mail store on a XSAN or ADIC (file level locking shared storage) and we could pitch Kerio into some larger installs. At least Kerio 6.5.2 onwards can do "kerio-Mail-HomeServer", so we can split home folders across multiple servers. If only we could get the calendars (free and busy) to work across multiple servers..
Anyhow.. all the best
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| Re: Need help for MX records [message #112057 is a reply to message #57450] |
Thu, 27 March 2014 14:09 |
atifdarr
Messages: 1
Registered: March 2014
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I read this thread and I think generic_penguin has the knowledge to advise me on my issue.
How do I force my mail server to do an MX lookup?
My issue is that I am sending mail from a local mail server and I want bounced mails to be collected by another external mail server. I am finding that the local mailserver is not performing an MX lookup and it will just sends the email back to itself.
Please note MX priorities are setup and tested. The problem is that MX records do not come into play.
Thanks in advance for any advise you can give me.
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| Re: Need help for MX records [message #112067 is a reply to message #112057] |
Thu, 27 March 2014 17:49 |
j.a.duke
Messages: 239
Registered: October 2006
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atifdarr wrote on Thu, 27 March 2014 09:09I read this thread and I think generic_penguin has the knowledge to advise me on my issue.
How do I force my mail server to do an MX lookup?
My issue is that I am sending mail from a local mail server and I want bounced mails to be collected by another external mail server. I am finding that the local mailserver is not performing an MX lookup and it will just sends the email back to itself.
Please note MX priorities are setup and tested. The problem is that MX records do not come into play.
Thanks in advance for any advise you can give me.
What is your local server? Kerio?
If it is Kerio, then you can always set forwarding options for a user not found in the local domain which could be set to forward to your external server.
Cheers,
Jon
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