Second E-mail server

["Tim Wu, VBISD Sys Programmer" <tim@xxxxxxxxx>]

Hi,
I have a question on e-mail server.
We have a NT mail server right now, but we want to try sendmail on
linux.  Will it be posibble we can bring up a send mail server and try
it before we replace the NT email server.  Because we are running our
own DNS.  We think if we put a A record to point to the test mail server
like "testmail.domain.org".  and leave the current mail server
"mail.domain.com". Will that work? I think we may not be able to access
the test mail server from outside of the network. But if we can try it
in our network, it should be a good test, shouldn't it. Or if anybody
has any better way to do it, please let me know.

Thank you very much

Tim