Cant work this one out, mail flow troubleshooter gives nothing.
I am in the process of moving from exchange 2003 to 2010.
Installed the first 2010 server, moved my mailbox to 2010.
I can receive emails but cant send any.
internal to mailboxes on the exchange 2003 servers nor external.
I have created the internet email connector in exchange 2010
Port 25 is open on the firewall.
I'd look at the firewall and internet email connector if it was only external email I couldnt send.
But its also internal mails.