Setting up sending mail via SMTP

Hello,

I've given the forums a search, so my apologies if this is something that has come up before...

I'm struggling to set up an outgoing mail server.  I'm using 1&1 and need to send via auth.smtp.1and1.co.uk on port 587 using TLS.  The server also requires authentication.  I've tried prefixing the hostname with tls:// and ssl:// as I saw, certainly the latter, mentioned somewhere, but no luck.  Each time I'm presented with the error:

Failed to connect to
ssl://auth.smtp.1and1.co.uk:587 [SMTP: Failed to connect socket:
Connection timed out (code: -1, response: )]

Failed to connect to
tls://auth.smtp.1and1.co.uk:587 [SMTP: Failed to connect socket:
Connection timed out (code: -1, response: )]

Hope somebody wouldn't mind giving me a hand to get going... thanks!