rfc7504.txt:John Klensin:jck:usa:7:jun:2015:UNKNOWN:kwd,seccons,ianacons:draft-klensin-smtp-521code:2010-11-18:2007-10-05:0:60:1064:14:1138:2:2004-09-20:0::2004-09-20:1110:2011-03-14:121