'mail.breathe.com' appears to be the pop3 server (for i/c mail). I would expect the setting for outgoing mail to be 'smtp.breathe.com' [which does exist].
However - if you connecting from the NTL network then the chances are it will probably fail as [like most ISP's] Tiscali will restrict access from IP addresses not on their network.
You could just use 'smtp.ntlworld.com' for the outgoing mail.