Problems with DNS and two different ISP’s

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I am busy setting up Tiger Server in our new office building. We are planning to use this server for Mail, Samba, VPN, iCal sharing, and maybe more in the future.

This mac is connected using a broadband connecting with a static IP .

Here is, what I think, is the problem:
Our company’s website is hosted at Verio.com including all the DNS info for it. For now i wanted to use a subdomain to acces the Tiger Server (local.example.com). I added an ‘A’ and a ‘MX’ record to the DNS zone file on Verio.com’s server.

But our other ISP, which provides our internet access, also gives us a domain name xxxxxx.example2.com

I am able to look up local.example.com and xxxxx.example2.com from anywhere on the internet (using SSH on other server’s) so that should be ok.

But the thing is when i do a reversed lookup on our IP address using OS X’s network utillity I get xxxxx.example2.com, the domain name our ‘internet connection’ ISP gave us.

Does the matter for setting up a mail server?

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