/sources/plan9/sys/src/cmd/upas/smtp/
      7725 2008-02-22 greylist.c
       801 2005-02-20 mkfile
      7753 2014-01-25 mxdial.c
     13464 2010-09-10 rfc822.y
      1102 2013-08-22 rmtdns.c
     21007 2013-11-09 smtp.c
      1375 2013-08-22 smtp.h
     36261 2014-02-04 smtpd.c
      1134 2008-01-28 smtpd.h
      6975 2010-09-10 smtpd.y
     10298 2009-11-20 spam.c