Here are my notes from the seminar. They may or may not be completely understandable, but hopefully they will provide some help for those who couldn't make it. MDA - mail delivery agent, delivers mail to an account on a system. Mail Store - where mail is placed. RFC 822 - defines the format of a mail message, including all headers and formats for proper email pieces.
Spammers often send incompliant mail messages.
MIME - a standard for detailing how to attach files to a text email. These are methods of accessing a mail box remotely. Pop is the older standard, good for low bandwidth, etc. Rather limited compared to Imap. Imap allows for folders, stay connected, manipulate messages.