I'm having a small issue with sending email on my Exchange 2010 Server. If I send email with Outlook and OWA, it works no problem, the issue is with Thunderbird, but I imagine I have my connectors configured incorrectly. I can receive email with no problems.
I have my hub transport server setup on a different VLAN and if I setup a mail client on that VLAN I can send mail no problem. If I am on a different VLAN, the SMTP ports are not visible for some reason. Its not a firewall issue, I checked. Any ideas?