Thunderbird problem sending Emails

Keep getting this error message, "An error occurred sending mail: Unable to authenticate to SMTP server smtp.supanet.com. The server does not support authentication (SMTP-AUTH) but you have chosen to use authentication. Untick 'Use name and password' for that server or contact your service provider."
No idea where to find the tick box to do what it says. Any ideas anyone?
TIA

 

Try
"Tools -> Account Settings -> Outgoing Server (SMTP)"

(if you're using Linux it's 'edit->account settings')

Hope that helps (I don't use Thunderbird, but do know my way around mail systems)

Steve

 

If it happens to others the actual sequence is
Tools
Account Settings.
Outgoing Server
Edit
Untick Box in the Wizard which then appears.

Thanks folks, really useful help, very grateful indeed.