Determine the differences between a denial of service email attack
from a typical denial of service attack on a user/domain to create a
definition of a denial of service email attack

Types:
Bandwidth consumption
Network connectivity
other types

bandwidth consumption - the attacker floods the victim with ICMP
packets, and tries to
                        consume all possible bandwidth. (Very Common)
Network Connectivity -  The attacker tries to connect to the victim in
such a way that
                        the connection disables a service.  An example would be a 
                        connection that never completes, but the service handeling
                        the connection reserves system resources to
complete a connection,
		        since the connection never completes, thhose resources are being
			consumed.



From http://whatis.techtarget.com
The examples of an email DoS attack
Email:
-Sending e-mail messages that have attachments with 
256-character file names to Netscape and Microsoft mail programs

-Sending to a user of the Pine 
e-mail progam a message with a "From" address larger than 256 characters

-A mail server (SMTP/POP etc) can fail if its "mail bombed". This is 
the act of sending hundreds and thousands of bogus emails in a very
short amount of time.