sed   -e 'x;/^$/{s/.*/stop/};x' \
       -e '/Content-Type:[ \t]*text\/plain[^\n]*$/I{x;/^start/{s/.*/stop/;x;p;d};x}' \
       -e '/Content-Transfer-Encoding:[ \t]*base64[^\n]*$/I{x;/^start/{s/.*/stop/;x;p;d};x}' \
       -e '/Content-Disposition:[ \t]*attachment[^\n]*$/I{x;/^start/{s/.*/stop/;x;p;d};x}' \
       -e '/^Content-Type:[ \t]*text\/plain/I{x;s/^stop/start/;x}' \
       -e 'x;/stop/be;x' \
       -e 'x;/^start\n[^\n]*\n*[^\n]*\n*[^\n]*$/{x;H;g;ba};x' \
       -e 'x;/^start$/!x; /^start$/{x;H}' \
       -e ':a' \
       -e '${s/^start\n//;q}'  \
       -e 'x;/^start\n[^\n]*\n*[^\n]*\n*[^\n]*$/{x;d};x' \
       -e '/^start/{s/^start\n//}' \
       -e '/\n>[^\n]*\r*$/{s/=\r*\n//; s/^[ \t]*\r*\(\n[^\n]\+\r*\n\)[ \t]*\r*\n\(>[^\n]*\r*$\)/\1\2/;p;x;s/.*/stop/;x;d}' \
       -e 'P;N;D' \
       -e ':e;x' $1 |\
 sed   -e '/^Content-Type:[ \t]*text\/plain/I{x;/^$\|ready/{s/ready/empty_line_pending/;s/^$/empty_line_pending/;x;/charset=/!{N; s/\n/;/ ; s/;;/;/ ; s/charset=us-ascii/charset=utf-8/};x};x}' \
       -e '/^Content-Disposition:[ \t]*attachment/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^Content-Transfer-Encoding:[ \t]*base64/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^[ \t]*\r*$/{x;/empty_line_pending/{s/empty_line_pending/start/};x}' \
       -e '/^--\+.\+-*\r*$/{x;/stop\|^$\|ready/{s/.*/ready/;G};x}' \
       -e 'x;/start/!be; x' \
       -e '/^--\+.\+-*\r*$/{G;s/\nstart\n/\n/;/^\(.*\)-*\r*\n\1\r*$/{s/\n.*$//;x;s/.*/stop/;be};s/\n.*//}' \
       -e '/^>/{x;/start/{s/.*/stop/};x}' \
      -re '/^-+-[^-]+.+-+-/{s/^-+-[^-]+.+-+-\r*$/\n\n>&/;x;s/.*/stop/;x;bz}' \
       -e '/^__*__[^_]+__*__/{s/^__*__[^_]+__*__\r*$/\n\n>&/;x;s/.*/stop/;x;bz}' \
       -e '/^_{30,}/{s/^_{30,}\r*$/\n\n>&/;x;s/.*/stop/;x;bz}' \
       -e '/^From:.*@.*/{s/^From:.*/\n\n>&/;x;s/.*/stop/;x;bz}' \
       -e ':z;p;d; :e; x'  |\
 sed   -e '/^Content-Type:[ \t]*text\/html/I{x;/^$\|ready/{s/ready/empty_line_pending/;s/^$/empty_line_pending/;x;/charset=/!{N; s/\n/;/ ; s/;;/;/ ; s/charset=us-ascii/charset=utf-8/};x};x}' \
       -e '/^Content-Disposition:[ \t]*attachment/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^Content-Transfer-Encoding:[ \t]*base64/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^[ \t]*\r*$/{x;/empty_line_pending/{s/empty_line_pending/start/};x}' \
       -e '/^--\+.\+-*\r*$/{x;/stop\|^$\|ready/{s/.*/ready/;G};x}' \
       -e 'x;/start/!be; x' \
       -e '/^--\+.\+-*\r*$/{G;s/\nstart\n/\n/;/^\(.*\)-*\r*\n\1\r*$/{s/\n.*$//;x;s/.*/stop/;be};s/\n.*//}' \
       -e '/<blockquote/{x;/start/{s/.*/stop/};be}' \
       -e '/<BLOCKQUOTE/{x;/start/{s/.*/stop/};be}' \
       -e '/<\/body/{x;/start/{s/.*/stop/};be}' \
       -e '/<\/BODY/{x;/start/{s/.*/stop/};be}' \
       -e '/<\/html/{x;/start/{s/.*/stop/};be}' \
       -e '/<\/HTML/{x;/start/{s/.*/stop/};be}' \
       -e '/>[ \t]*-*.*=\r*$/{N;s/=\r*\n//;bi}' \
       -e '/>[ \t]*_*.*=\r*$/{N;s/=\r*\n//;bi}' \
       -e '/<*s*p*a*n* *c*l*a*s*s*=*3*D*\"*A*p*p*l*e*-*s*t*y*l*e*-*s*p*a*n*\"* =\r*$/{N;s/=\r*\n//;bi}' \
       -e ':i' \
      -re '/class=\"moz-cite-prefix\"/{s/class=\"moz-cite-prefix\"/<blockquote &/;x;s/.*/stop/;x;bz}' \
       -e '/\"Apple-style-span\"/{s/<span class=3D\"Apple-style-span\" /<blockquote &/;x;s/.*/stop/;x;bz}' \
       -e '/class=\"moz-forward-container\"/{s/class=\"moz-forward-container\"[^>]*>/&<div><\/div>/}' \
       -e '/>*[ \t]*-+-[^-<>]+.+-+-/{s/[ \t]*-+-[^-<>]+.+-+-/<\/b><\/i><blockquote &>/;x;s/.*/stop/;x;bz}' \
       -e '/>*[ \t]*__*__[^_]+__*__/{s/[ \t]*__*__[^_]+__*__/<\/b><\/i><blockquote &>/;x;s/.*/stop/;x;bz}' \
       -e '/>*[ \t]*_{30,}/{s/[ \t]*_{30,}/<\/b><\/i><blockquote &>/;x;s/.*/stop/;x;bz}' \
       -e '/>*[ \t]*From:/{s/[ \t]*From:/<\/b><\/i><blockquote &>/;x;s/.*/stop/;x;bz}' \
       -e ':z; p;d; :e; x'  |\
  sed  -e '/^Content-Type:/I{x;/^$/{s/.*/stop/};x}' \
       -e '/^Content-Transfer-Encoding:.*base64/{x;/ready/{s/.*/empty_line_pending/};x}' \
       -e '/^Content-Disposition:.*attachment/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^Content-Type:[ \t]*text\/plain.*/I{x;/^$/{s/.*/ready/};x}' \
       -e '/^[ \t]*\r*$/{x;/empty_line_pending/{s/.*/start/};x}' \
       -e 'x; /start/!be; x' \
       -e '/^--\+.\+-*\r*$/{x;/start/{s/.*/stop/};be}' \
       -e "/^[ \t]*\r*$/{n;:a;N;\$!{/\n[ \t]*\r*$\|\n--\+.\+-*\r*$/!ba};s/\n[ \t]*\r*$//; s/\n--\+.\+-*\r*$//; s/^/\"'/ ; s/\$/'\"/ ; s/.*/echo \"&\" | base64 -d/e ; x;s/.*/stop/;x}" \
       -e 's/\n>/\n\n>/ ; /\n\n>/bz' \
      -re 's/\n-+-[^-\n]+-+-.*$/\n\n>&/; /\n\n>/bz' \
       -e 's/\n__*__[^_\n]+__*__.*$/\n\n>&/; /\n\n>/bz' \
       -e 's/\n_{30,}/\n\n>&/; /\n\n>/bz' \
       -e '/\nFrom:.*@.*/{s/\nFrom:/\n\n>&/; /\n\n>/bz}' \
       -e ":z; s/^/\"'/ ; s/\$/'\"/ ; s/.*/echo \"&\" | base64/e ; s/$/\r\n/;p;d;:e; x" |\
  sed  -e '/^Content-Type:/I{x;/^$/!{s/.*/stop/};x}' \
       -e '/^Content-Transfer-Encoding:.*base64/{x;/ready/{s/.*/empty_line_pending/};x}' \
       -e '/^Content-Disposition:.*attachment/{x;/^$/!{s/.*/stop/};x}' \
       -e '/^Content-Type:[ \t]*text\/html.*/I{x;/^$/{s/.*/ready/};x}' \
       -e '/^[ \t]*\r*$/{x;/empty_line_pending/{s/.*/start/};x}' \
       -e 'x; /start/!be; x' \
       -e '/^--\+.\+-*\r*$/{x;/start/{s/.*/stop/};be}' \
       -e "/^[ \t]*\r*$/{n;:a;N;\$!{/\n[ \t]*\r*$\|\n--\+.\+-*\r*$/!ba};s/\n[ \t]*\r*$//; s/\n--\+.\+-*\r*$//; s/^/\"'/ ; s/\$/'\"/ ; s/.*/echo \"&\" | base64 -d/e ; x;s/.*/stop/;x}" \
      -re 's/class=\"moz-cite-prefix\"/<blockquote &/ ; /<blockquote/bz' \
       -e 's/class=\"moz-forward-container\"[^>]*>/&<div><\/div>/' \
       -e 's/>*[ \t]*--+-[^-\n]+--+-/<\/b><\/i><blockquote &>/ ; /<blockquote/bz' \
       -e 's/>*[ \t]*__*__[^_\n]+__*__/<\/b><\/i><blockquote &>/ ; /<blockquote/bz' \
       -e 's/>*[ \t]*_{30,}/<\/b><\/i><blockquote &>/ ; /<blockquote/bz' \
       -e '/>*[ \t]*From:/{s/>*[ \t]*From:/<\/b><\/i><blockquote &>/ ; /<blockquote/bz }' \
       -e ":z; s/^/\"'/ ; s/\$/'\"/ ; s/.*/echo \"&\" | base64/e ; s/$/\r\n/;p;d;:e; x"
       #-e ":z; ; s/$/\n/;p;d;:e; x"