Question about sendmail...

[Philip Prindeville]

Craig White wrote:

>On Thu, 2005-10-27 at 20:26 -0600, Philip Prindeville wrote:
>  
>
>>I'm running FC3 (updated) on a handful of machines.
>>
>>I have a single IP address, with a NATing router set to that
>>address.  I have a domain, and an MX which points through
>>the router at my mail server (or rather, the router is configured
>>to port-forward 25, 143, etc to the mail server).
>>
>>I also have several mail clients on my 192.168.1.x network.
>>
>>The issues are the following:
>>
>>* the clients have a smart host (DS) defined as the mail relay,
>>   but they canonical its name and then look it up in the DNS,
>>   trying to contact it on the external IP address (and not its
>>   internal 192.168.1.x address in the /etc/hosts file).  My
>>   /etc/nsswitch.conf file is unmodified.
>>
>>* the clients then try to relay the email with a sender's envelope
>>   address as user at host.my-domain, which the relay rejects
>>   because "host.my-domain" doesn't resolve in the DNS.
>>
>>* I should probably have define(`LOCAL_RELAY', `:$S') to
>>   handle forwarding everything to the mail server.
>>
>>I used to know all of this stuff once upon a time...
>>
>>Am I missing anything?
>>    
>>
>----
>I've never used 'LOCAL_RELAY' so I can't help you there. I typically run
>my own DNS servers inside the LAN so that the name resolution is
>completely under my control - where mail.mydomain_name.com would resolve
>to an internal mail server which handles end delivery (or smart host
>delivery).
>
>If you don't want to run your own DNS, it's just simpler to use smart
>host pointing directly to the ip address of your mail server directly
>instead of a name which loops the connection outside of the trusted LAN.
>  
>

Gah!   I thought about that, but I was hoping there was a less
heinous fix.

-Philip

>Craig
>
>
>  
>