Russell Coker <[email protected]> writes:

> On Thu, 15 May 2014 11:57:02 Nic Baxter wrote:
>> > 3. Able to authenticate as above if using ip number instead, which makes
>> > sense, since in office wifi and mail server on same subnet (192.168.1.X)
>> 
>> Hi Daniel
>> I suggest this is not an issue with the server but with the client.
>> My suggestion would be to ping the mail server using the domain name and
>> see if it resolves. It might also be a good idea to run ipconfig /flushdns
>
> It sounds like the DNS has the external IP address and the routers
> aren't setup to allow connections to the external address from inside
> the organisation.
>
> The best thing to do is to configure NAT on a router to redirect the
> external IP to the internal IP.  It will be tempting to have separate
> internal and external views in the DNS, but don't do that, it causes
> lots of pain in the long term.

Or split-horizon DNS.

(It's not nice, but IMO NAT is worse.)

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