Re: DNS Madness

Many thanks Dmitriy!

I had forgot my home xmail server used to be a relay for my work one. 
Not anymore, however, I never removed the configuration.

In order to better filter spam, I had to set a domain for my company on 
this server and the ip address actually is in mailproc.tab under 
MailRoot/domains/<domain>



Dmitriy Vitoshnov wrote:
> Another reason for such work can be in file "smtpfwd.tab"
> 
> Vitoshnov Dmitriy 
> 
> 
>> -----Original Message-----
>> From: [email protected] [mailto:xmail-
>> [email protected]] On Behalf Of gilad
>> Sent: Friday, June 18, 2010 12:47 PM
>> To: XMail Users Mailing List
>> Subject: Re: [xmail] DNS Madness
>>
>>
>> There was a record for the domain, however, it contained the name of
>> the
>> mail server (i.e. <mmil.workdomain.com>)
>>
>> Just in case I deleted it and restarted the server to no avail.
>>
>> I also grep'd all the files under dnscache looking for the ip address
>> and did not find it.
>>
>>
>>
>> Dmitriy Vitoshnov wrote:
>>> Xmail have folder dnscache.
>>> I think that there is a copy of the MX-recording with your old IP-
>> address.
>>>
>>>
>>> Vitoshnov Dmitriy
>>>
>>>
>>>
>>>
>>>
>>>> -----Original Message-----
>>>> From: [email protected] [mailto:xmail-
>>>> [email protected]] On Behalf Of gilad
>>>> Sent: Friday, June 18, 2010 11:38 AM
>>>> To: [email protected]
>>>> Subject: [xmail] DNS Madness
>>>>
>>>> Where does xmail get the ip address for a domain name?
>>>>
>>>> I run my own home xmail server (on pclinuxos) and a forwarding only
>>>> named on a home server machine. It uses my personal domain name.
>>>>
>>>> At work I also run an xmail server (on centos) using my company's
>>>> domain
>>>> name  (different from my personal domain name.)
>>>>
>>>> Few days ago the IP address for the work server has changed. Now my
>>>> home
>>>> xmail server can't deliver email an account on the work server.  It
>>>> seems xmail on the home machine resolves the company's domain name
>> to
>>>> its old ip address.  I verified this by looking at the outgoing
>> traffic
>>>> from that machine.
>>>>
>>>> However, on the same machine running various dns tools
>>>> (host,nslookup,dig) all correctly show the new address for the work
>>>> mail
>>>> server.  Also I can connect to it using telnet. However the mail
>> server
>>>> tries to connect to the old address.
>>>>
>>>> I finally gave up on finding where the problem is and set  up an
>>>> iptables rule to modify outgoing traffic to the old address to go to
>>>> the
>>>> new address, and voila the home mail server now connects to the work
>>>> mail server and works.
>>>>
>>>> As a reference the iptables rule on the home mail server machine
>> looks
>>>> like this:
>>>>
>>>> iptables -t nat -A OUTPUT -d <work mail server old ip address> -j
>> DNAT
>>>> --to <work mail server new ip address>
>>>>
>>>> Again, on the home server machine (where the confused xmail server
>>>> runs)
>>>> dig <workdomain.com> mx
>>>> returns correctly return <mmil.workdomain.com> and
>>>> dig <mail.workdomain.com>
>>>> correctly returns the new ip address.
>>>>
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> 
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