I have Installed Exchange 2007 (seem ok) and mail flow locally is fine (this is good)
I have purchased from DYDNS a DNS name, mail hop outbound and mailhop relay as I cannot buy a static ip address from my ISP
I have opened smtp port 25 on the router - test ok with a port checking tool.
When I try to send a test message from any internal user of this exhange system to an external recipient (ie my yahoo a/c) the message does not arrive.
I have had a look at the queue viewer the current state of the next hop domain is "Unreachable domain"
I realise this is vague but i am struggling to set up these connectors and would welcome some help.