transfer level
**************

message $B$KA^F~$9$k(B data $B$O(B 7bit (See (tm-ja)7bit) $B$J$$$7(B 8bit (*Note
(tm-ja)8bit::) $B$b$7$/$O(B binary (See (tm-ja)binary) $B$GI=8=$9$k$3$H$,$G(B
$B$-$^$9!#(B

$B$h$C$F!"(B7bit $B$7$+DL$5$J$$(B MTA (See (tm-ja)MTA) $B$r7PM3$9$k>l9g!"(B7bit $B$N(B
data $B$O$=$N$^$^$GAw$l$^$9$,!"(B8bit $B$d(B binary $B$N(B data $B$O(B 7bit $B$KJQ49$7$J$1$l(B
$B$P$J$j$^$;$s!#(B

$BF1MM$K!"(B8bit $B$7$+DL$5$J$$(B MTA $B$r7PM3$9$k>l9g!"(B7bit $B$d(B 8bit $B$N(B data $B$O$=$N(B
$B$^$^$GAw$l$^$9$,!"(Bbinary $B$N(B data $B$O(B 7bit $B$+(B 8bit $B$KJQ49$7$J$1$l$P$J$j$^$;(B
$B$s!#(B

*[Memo]*
     EBCDIC $B$7$+DL$5$J$$(B MTA $B$r7PM3$9$k>l9g!"(B7bit $B$N(B data $B$b(B base64 $BEy$GJQ(B
     $B49$7$J$$$HAw$l$^$;$s$,!";d$O(B EBCDIC $B$N$3$H$^$G$OCN$j$^$;$s!#(B(^_^;

     $BF1MM$K!"@)8fJ8;z$rDL$5$J$$(B MTA $B$N$3$H$d(B code $BJQ49$r9T$J$&(B MTA $B$b>C$((B
     $B$F$J$/$J$C$FM_$7$$$G$9!#(B(^_^;

     binary $B$bDL$9(B MTA $B$bB8:_$9$k$s$G$7$g$&$,!":#$N$H$3$m$"$^$j0lHLE*$H$O(B
     $B$$$($J$$$G$7$g$&!#(B

*transfer level* $B$H$$$&$N$O$I$NHO0O$N(B data $B$^$GAw$l$k(B
$B$+$H$$$&$3$H$rI=$9$b$N$G$9!#(Btm-edit $B$O(B`mime-editor/transfer-level' $B$H$$$&(B
$BJQ?t$r;}$C$F$*$j!"$3$l$G(Btransfer level $B$rI=8=$7$^$9!#(B


 -- Variable: mime-editor/transfer-level

     transfer level $B$rI=$9!#(B

     $B$"$k(B data $B$N(B transfer level $B$,$3$NCM$r1[$($k>l9g!"(B7bit data $B$X$NJQ49(B
     $B$,9T$o$l$k!#(B

     $B8=:_$N$H$3$m!"(B7 $B$+(B 8 $B$,M-8z$G$"$k!#4{DjCM$O(B 7 $B$G$"$k!#(B

     EBCDIC $B$r(B 5, ASCII printable $B$N$_$r(B 6, binary $B$r(B 9 $B$H$9$k$3$H$r7W2h$7(B
     $B$F$$$k$,!"<BAu$NM=Dj$O$J$$!#(B



*[Memo]*
     transfer level $B$O(B message header (See header) $B$K$O4X78$7$J$$!#(B
     RFC 1521$B$O(B body $B$K$*$$$F!"(B8bit $B$N(B data $B$r;H$($k$h$&$K(B RFC 822
     (See (tm-ja)RFC 822) $B$r3HD%$7$F$$$k$,!"(Bmessage header $B$G$O(B 
     us-ascii (See (tm-ja)us-ascii) $B$N$_$rMQ$$$k$3$H$r5a$a$F$$$k!#(B