Hi, welcome to the LQ forums.
OK, there are several questions here:
1. "ronlt.sparks.endoftheinternet.org" is not written in your hosts file. Also, I am not sure you are allowed to double IP addresses. You should have one IP and list of hostnames. like this:
192.168.1.80 noodle.sparks.endoftheinternet.org noodle ronlt ronlt.sparks.endoftheinternet.org
I think this should work.
For your other questions, it would be best to set up mail server on one machine and point all others on that one.