I've been working on installing Postfix, Dovecot, OpenDKIM, OpenDMARC, and Roundcube on my own AWS instance lately. It's going OK...<p>I've begun to become curious about how exactly email works on a network level. Perhaps if I understood that better, I would be better equipped to get what I'm trying to do done.<p>There are thousands of articles out there when you search "How does email work?" on Google.<p>I assume HNers could point me in a better direction that Google could on this matter, however.