My e-mails are not sending. "connection to SMTP server timed out." How do I get this working?

As of yesterday, I am receiving e-mails fine; however, unable to send. Everytime I try to send an e-mail, I get "Sending of message failed. The message could not be sent because the connection to SMTP server (my mail address) timed out. Try again or contact your network administrator.
I received help from lunarpages (they host my domain); however, they were unable to resolve the issue. They suggested something is blocking IP, or need to update Thunderbird, or there's a firewall there...
Help!!!
My clients are waiting for responses to e-mails!
Thank you.

To diagnose problems with Thunderbird, try one of the following:
*Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode). On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.
*Restart the operating system in '''[http://en.wikipedia.org/wiki/Safe_mode safe mode with Networking]'''. This loads only the very basics needed to start your computer while enabling an Internet connection. Click on your operating system for instructions on how to start in safe mode: [http://windows.microsoft.com/en-us/windows-8/windows-startup-settings-including-safe-mode Windows 8], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-7 Windows 7], [http://windows.microsoft.com/en-us/windows/start-computer-safe-mode#start-computer-safe-mode=windows-vista Windows Vista], [http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/boot_failsafe.mspx?mfr=true" Windows XP], [http://support.apple.com/kb/ht1564 OSX]
; If safe mode for the operating system fixes the issue, there's other software in your computer that's causing problems. Possibilities include but not limited to: AV scanning, virus/malware, background downloads such as program updates.

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