[CentOS] Split dns issues

[Les Mikesell]

Jason Pyeron wrote:
>  
>> I'd expect the most common case to be mail user agents that 
>> have to be specifically configured for the forwarding smtp 
>> server anyway.  
> 
> In fact most are default configurations. An engineer will up an (vm) image, give
> it some tasks to do (temp website, software builds, experimental config, etc...)
> and the data/logs are emailed to him when done.

You might be able to handle these scenarios by providing a different 
internal-only DNS domain that you configure your mail server to accept 
in addition to the current domain.  Then anyone who wants to skip the 
spam scan can use a target mail address with the internal name.

>> What else do you have sending a lot of 
>> internal mail?  
> 
> Think about things like logwatch, cron, at, etc..., but not always on linux.
> This will get forwarded to support or a specific engineer.
> 
> 
>> Or are these laptops that may or may not have 
>> direct access to the internal server?
>>
> 
> That is one of our use cases, exactly, and that is where this mail will come
> from.

This one is harder - maybe even impossible to get completely right if 
you count the case where you set up temporary VPN access to reach the 
internal target from a LAN where you also need to maintain similar 
private DNS mapping, for example to access a local printer.

-- 
   Les Mikesell
    lesmikesell at gmail.com