How to configue ssmtp for authentication?

[Jin Guojun [VFFS]]

Try to use send-pr but cannot get ssmtp to work with DSL ISP mail server,
because ISP mail server requires password for authentication.

I could not find information on how to configure SSMTP to pass password
to the ISP mail server.
Can someone tell me if SSMTP is possible to accomplish such task? or I need
to use some other mail programs.

TIA,

    -Jin