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WikiPedia: Post Office Protocol http://www.eventhelix.com/RealtimeMantra/Networkin... //books.google.com/books?id=UD0h_GqgbHgC&printsec=... http://mail.google.com/support/bin/answer.py?answe... http://journal.mycom.co.jp/special/2001/onlinenote... http://www.pop4.org/pop4/pop4spec.html https://web.archive.org/web/20080913155355/http://... https://web.archive.org/web/20171021231958/http://... https://www.iana.org/assignments/port-numbers