Exchange 2007 won't send mails. Installed into Exchange 2003 site using IIS 6 SMTP relay


I have a client who was running Exch2K3 in his internal network.  He had an IIS 6 box acting as an SMTP relay in his DMZ.

He has installed Exch2k7 (everything on one server) alongside his Exch2K3 machine, and migrated a few accounts, but cannot send external (internet) mails.

I have no experience with Exch2007 at all, so am completely lost as to how this should be setup.  Ideally he wants to get rid of his Exch2K3 server.

Can anyone tell me (in broad terms) how this should be configured?  Should he still be using the IIS 6 SMTP stuff, or should he be using some Exch2K7 solution instead to route the internet mail?  What send connectors should be in place?  Can he just forget about the 2K3 server or is it now entwined in his Exchange infrastructure.

So to recap, he had 2 servers.

Exchsrv2003 sending via iisserver.

Now he has Exchsrv2007 trying to send via iisserver, but it's not working.   He has put the mail accounts back onto the Exch2K3 machine, but that's not working either.

Help very much appreciated as I have no idea where to start.

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lambch0pAuthor Commented:
Thanks.  Going through the posts now, will let you know how I get on.
lambch0pAuthor Commented:

Still don't know the exact problem, but by working starting from scratch and working through those guides, my client got it all working.


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