Sending email via SMTP with password?

Has anyone successfully managed to use an Arduino + Ethernet Shield to send an email via an SMTP server that requires a password? If so, how is it done please?

Thanks.

Are you trying to send email through any server or do you have a particular server in mind?

I ask because the "any server" case is very unlikely to work with an Arduino. The SMTP server I use is a great example. It requires first checking email (to ensure I have an account with my service provider) and it requires the use of TLS. The first part will probably work on an Arduino but the second part is probably a bit too much.