You may be confusing two things:
POP3 is a 'pull' protocol; your machine connects to a POP3 server and requests any mail.
SMTP is a 'push' protocol; the SMTP machine tries to connect to the next machine in the route to the destination.
It's the standard method for sending email from any normal email program.
Some ISPs offer SMTP for customers to receive email - rather than waiting for mail to be fetched, the ISPs server connects to the customers system and delivers each email as it arrives.
This is normally an extra, chargeable, service.
As far as the Authenticated SMTP bit, if that is for sending mail, it's possibly a 'roaming' account.
Many ISPs don't use authentication for outgoing email, but block it unless the machine sending the mail is connected through an account (ADSL / Cable) that they control, and sometimes only permit 'from' addresses that resolve back to their servers.
If you want to be able to send email from any internet connection, then they require password protection to prevent spammers using their system.
You mention a Website rather than an ISP? If you are using a different web host to your ISP, you can either forward email to the web site address on to your ISPs email, or set up outlook to use the web hosts pop3 and your ISPs outgoing smtp server.
Sorry if this is a bit generic, but the question is not clear..
If it does not help, please post a new question with more detail, like who the web host is and who your ISP is (but not any usernames etc).
That will allow people to look at the possible email server setups for those companies.