So you’ve set up smtp on a server but need to check to make sure that the server is ‘ready to go’ as soon as the Web/Mail hoster cuts over the MX records?
From the outside (and this is where a little bit of RWW can help… ) telnet to the IP address of the server
telnet blah.blah.blah.blah 25
You then get back this… indicating you are good to go
220 domain.com Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at Wed,
22 Nov 2006 15:39:46 -0800
See? You can then see that you are ready to go…