This is the best simplified description of email and the email system I've read. It's simple to understand and fully comprehensive—with the exception of RFCs o

This is the best simplified description of email and the email system I've read. It's simple to understand and fully comprehensive—with the exception of RFCs of course (but often they aren't easy to understand). A highly recommended read/reference whether you're an email neophyte or one who builds email clients or server software.