www.faqs.org/faqs/LANs/mail-protocols
www.tele.sunyit.edu/multiple_access_protocols.htm
www.compsci.buu.ac.th/reference/ComputerNetworking/5_3.htm
www.cs.williams.edu/~tom/courses/336/homeworks/ex4.html
www.paradise.caltech.edu/~lemahieu/cs138/project.html
www.uni-giessen.de/faq/archiv/lans.mail-protocols
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