POP3 1984 1984 1985 1985 1984->1985 1988 1988 1985->1988 1991 1991 1988->1991 1993 1993 1991->1993 1994 1994 1993->1994 1996 1996 1994->1996 1997 1997 1996->1997 1998 1998 1997->1998 1999 1999 1998->1999 2002 2002 1999->2002 2006 2006 2002->2006 2007 2007 2006->2007 2010 2010 2007->2010 2011 2011 2010->2011 2013 2013 2011->2013 2016 2016 2013->2016 2018 2018 2016->2018 RFC0918 RFC0918 RFC0937 RFC0937 RFC0918->RFC0937 RFC1081 RFC1081 RFC1225 RFC1225 RFC1081->RFC1225 RFC1082 RFC1082 RFC1460 RFC1460 RFC1225->RFC1460 RFC1725 RFC1725 RFC1460->RFC1725 RFC1939 RFC1939 RFC1725->RFC1939 RFC1734 RFC1734 RFC5034 RFC5034 RFC1734->RFC5034 RFC1957 RFC1957 RFC1939->RFC1957 RFC2449 RFC2449 RFC1939->RFC2449 RFC6186 RFC6186 RFC1939->RFC6186 RFC8314 RFC8314 RFC1939->RFC8314 RFC2095 RFC2095 RFC2195 RFC2195 RFC2095->RFC2195 RFC2384 RFC2384 RFC2449->RFC5034 RFC2595 RFC2595 RFC4616 RFC4616 RFC2595->RFC4616 RFC7817 RFC7817 RFC2595->RFC7817 RFC2595->RFC8314 RFC3206 RFC3206 RFC5721 RFC5721 RFC6856 RFC6856 RFC5721->RFC6856 RFC6186->RFC8314 RFC6857 RFC6857 RFC6858 RFC6858