Email
	SMTP send email from sender to server
	You find the SMTP server by looking up an mx record.  dig -t mx fred.com
	Email can be stored in /var/mail/USRENAME or /home/USENAME/Maildir
	Email has a header, blank line, and a body
	Body can use mime-encoding to send pictures or attachments

Postfix
	designed for security not performance
	configs in /etc/postfix/main.cf
	aliases in /etc/alias don't forget newaliases
	mydestinations is for whom will you take email
	relayhost is for smart relaying
		typically filtered
		useful for firewalls
		Sometimes firewalls are a good thing.
	mailbox size limit is obvious
	Log file is in /var/log/mail.log and is actually useful
	
Delivery
	There are .forward files
	There are aliases
		Aliases can nest
	You can only alter email of traffic that goes throu your system

Courier
	Can do POP and IMAP
	Allows a client to work with an email store (typically your /home/USER/Maildir)
	Requires passwords
	Can work with your iPhone if you want.

Spam
	More than 90% of all email is spam
	Detection methods
		Feature detection
			Method
				is the date formatted wrong
				does it come from the future
			Countermeasure
				Don't make mistakes
		Blacklists
			Method
				reject email from known spammers
				Many lists to chose from
				Can both blacklist and whitelist
			Countermeasure
				Email by Virus
				Change servers alot
		Baysian Analysis
			Method
				Looks for hammy or spammy words or phrases
			Countermeasure
				Don't use spammy phrases
				Vogon poetry


Activities
	Find the mx record of your facorite email site
	Send yourself a picture.  Look at the raw message body