a new sendmail question

[Tom Horsley]

I have tried to poke around in google for this before,
but never found a satisfactory answer.

Say I'm not running my own server, I don't have a domain name,
i.e., a typical home computer.

Can I configure sendmail to shuffle local mail around to
local mailboxes, and take mail to external addresses
sent by me and direct it to my ISP smtp server (which
needs an SSL connection and user and password
authorization).

Or is there something that can act a lot like sendmail
but is easier to configure to do this sort of thing?