I'm configuring sendmail that runs on Linux Slackware but find some difficulties to do some quick startup due to its complexity and massive documentation.
Suppose I want to configure a sendmail that can serve 2 domains:
I use noip2 client software to connect with noip server that translates the dynamic IP addressed domains, setups POP, and does forwarding.
By having 2 domains, I want to able to send email between firstname.lastname@example.org
;therefore, my machine acts as both a server and a client.
How can I setup sendmail so that it acts as both server and client?
How to register email address and its domain on sendmail?