What the simplest way to do outgoing smtp?

[philip payne]

Hi,

This is a pretty basic question so I don't mind if the answer is an RTFM
style link. ;-)

I recently obtained some 3rd party POP3 mailboxes unrelated to my current
ISP for email to a new domain... unfortunately my ISP's smtp server doesn't
let me send any email addressed as anything other than it's own users, fair
enough.

I use FreeBSD as a network gateway and IPFW device but I'm a bit of an SMTP
novice really.

How and what can I configure to act as a sending SMTP server simply on
FreeBSD?

I don't need to receive email, the 3rd party will do that and host the POP3
collection, but I need to be able to send email locally via something other
than my ISP's smtp server.

The reason I want to do it this way is that the IP address of my FreeBSD box
is DHCP and subject to change, so it isn't suitable as the primary MX record
for the new domain.

Thanks muchly,

Phil.