Multipurpose Internet Mail Extensions

Multipurpose Internet Mail Extension??ｽｼ???ｽ､????ｽｮ??????ｽ､???ｽｳ???ｽｿ???ｽｼ????????????ｽ｡???ｽｼ???ｽｫ???ｽ｡??ｽｼ?ｽｵ??ｽｼ????ｽｯ?????ｽｦ????ｽｼ??ｽｸ?US-ASCII???ｽｮ??????ｽｭ???ｽｹ???????????ｽｽ?ｽｿ???ｽｨ???ｽｧ??????ｽｪ??????ｽ､???ｽｳ???ｽｿ???ｽｼ????????????ｽｮ???ｽｻ??ｽｭ????ｽ｡???ｽｼ???ｽｫ???ｽｧ??????ｽｾ??????ｽｾ???ｽｪ??????ｽｩ???ｽｼ???????????ｽｼ????ｽｸ??ｽｼ???ｽｼ???????ｽｱ???????????????ｽｫ????????ｽｦ????ｽｼ???ｽｧ??????????????ｽｸ?ｽｸ???ｽｯMIME??ｽｼ???????ｽ､?????ｽｼ????ｽｨ???ｽ･????????????RFCﾂ?2045???RFCﾂ?2046???RFCﾂ?2047???RFCﾂ?4288???RFCﾂ?4289^[1]???RFCﾂ?2049 ???ｽｧ??ｽｦ???ｽｮ??????????ｽｦ?????????

???ｽ､???ｽｳ???ｽｿ???ｽｼ????????????ｽｧ???ｽ｡???ｽｼ???ｽｫ???ｽｮ???ｽｸ??ｽｼ??????ｽｮ???????ｽｦ?????? RFCﾂ?5322 (???ｽｧ RFCﾂ?822???RFCﾂ?2822)???ｽｧ???ｽｯ??????ｽｱ???ｽｰ??ｽｭ????ｽｨ?????????ｽ､??????ｽｮ??ｽｨ????ｽｷ???7 ????????????ｽｧ??ｽ｡?ｽｨ???ｽｾ?????????US-ASCII??????ｽｨ???ｽｼ???ｽｰ???????????ｽｭ????ｽｳ???ｽｼ?????????ｽｩ???ｽｨ??????1??ｽ｡??????????1000 ??????ｽ､???(???ｽｹ??ｽ｡???????ｽｫ???)???ｽｮ??????ｽｭ???ｽｹ?????????ｽｼ???ｽｿ????????ｽｨ?ｽｱ??????ｽｦ??????ｽｪ????????????ｽｮ???????????ｽｦ????ｽｼ???ｽｫ??ｽｸ????ｽｩ??????ｽｫ???ｽｪ????????????ｽｪ???ｽｷ?????ｽ｡????US-ASCII?????????ｽｧ??ｽ｡?ｽｨ???ｽｾ???ｽｧ??????ｽｪ????????ｽｭ?????????????ｽ､??????ｽｪ??????ｽｼ???ｽｿ??????ｽｻ?????????ｽｳ??ｽ｣?ｽｰ???ｽｪ???ｽｩ???ｽｮ????????ｽｭ???????ｽｼ???ｽｿ??????ｽｩ???ｽｨ????????????ｽｨ??????ｽｧ??????ｽｪ??????ｽ｣??????

MIME???ｽｯ????????????ｽｮ??????ｽｼ???ｽｿ????????????ｽｱ????????????ｽｫ???ｽｰ???????????????ｽ､??????ｽｮ??????????????ｽｮ???ｽｾ?ｽｩ????????????ｽ､US-ASCII??ｽｸ????ｽｧ??????ｽｾ??????ｽｾ???ｽｪ??????ｽｼ???ｽｿ???ｽｿ???ｽ､????????ｽ｡?ｽｨ???ｽｾ???????????????ｽｮ??ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｼ??????ｽｦ???ｽｮ???????ｽｦ?????????

RFCﾂ?5322 (???ｽｧ RFCﾂ?822???RFCﾂ?2822)???ｽｧ???ｽｯ1 ??????ｽｮ???ｽ｡???ｽｼ???ｽｫ???ｽｧ1???ｽ､???ｽｮ???ｽｬ????????????ｽｱ?????????ｽｨ??????ｽｧ??????ｽｪ?????????MIME???ｽｧ???ｽｯ???ｽｬ????????????ｽｲ??????ｽｦ??ｽ､????ｽｰ???ｽｮ???ｽｳ???ｽｳ??????ｽｳ?????????ｽｱ?????????ｽｨ??????ｽｧ???????????????ｽｫ????????????????????????ｽｫ?????????ｽｼ??????ｽｨ???ｽｼ???ｽｶ???MIME????????????ｽｫ???ｽｯ???MIME???ｽ｡??????ｽｻ???ｽｼ???ｽｸ????????????ｽｨMIME??????ｽｼ???????????????ｽｮ??ｽｺ????ｽ､????????????MIME???ｽ｡??????ｽｻ???ｽｼ???ｽｸ????????????ｽｯ???ｽ｡??????ｽｻ???ｽｼ???ｽｸ???ｽｨ??ｽｽ????ｽｫ???ｽｩ???ｽｨ?????????MIME??????ｽｼ???????????????ｽｯ??????ｽｫ?????????ｽｼ??????ｽ｡??????ｽｻ???ｽｼ???ｽｸ???ｽｮ??????ｽｨ??????ｽｫ???ｽｩ???ｽｨ??????????????????ｽｫ?????????ｽｼ??????ｽｫ?????????1???ｽ､???ｽｮ???ｽ｡???ｽｼ???ｽｫ???ｽｫ??ｽ､????ｽｰ???ｽｮ??ｽｨ?ｽｮ??ｽ｡????ｽｮ??????ｽ｡???ｽ､???ｽｫ??????ｽｱ?????????ｽｨ??????ｽｧ???????????????ｽｫ???ｽｪ???ｽ｣??????

???ｽｾ??????HTTP???ｽｫ???????????????ｽｼ???ｽｿ???ｽｮ??ｽｼ???????ｽｫ???ｽ｢??????ｽｦ??????MIME???ｽｮ?????ｽｵ????ｽｿ??????ｽｴ???ｽｨ?????????ｽｦ?????????

??ｽｾ????ｽ･???ｽｮRFCﾂ?5322 (RFCﾂ?822, RFCﾂ?2822) ??ｽｺ???????ｽｮ???ｽ｡??????ｽｻ???ｽｼ???ｽｸ???ｽｨ???ｽｮ???ｽｺ???ｽ･???????????????ｽｯ??ｽｰ????ｽ･MIME??????ｽ｡??ｽｼ?ｽｵ????????????ｽｨ??????ｽｫ??????ｽｼ???ｽｸ???ｽｧ???ｽｳ??????ｽｺ???ｽ･???????????????ｽｮ???????????????ｽｾ???ｽｨ???ｽｯ1.0???ｽｮ???ｽｿ?????ｽｦ???ｽｮ??????????ｽｦ?????????

Mime-Version: 1.0

??????ｽｮ???ｽ｡??????ｽｻ???ｽｼ???ｽｸ??ｽｸ?ｽｭ???ｽｮ??????ｽｼ???ｽｿ???ｽｮ??ｽｨ?ｽｮ??ｽ｡?????????ｽｮ?????????? ??ｽｸ????ｽｬ??????ｽｪ???ｽｸ??ｽｼ????ｽｯ??ｽｬ?ｽ｡???ｽｮ?????????

Content-Type: type/subtype; parameter

type???ｽｯ??ｽ､?ｽｧ?????ｽ｡????ｽｨ???ｽｪ?????????ｽｼ???ｽｿ???ｽｮ??ｽｨ?ｽｮ??ｽ｡?????????ｽｮ??????????subtype???ｽｫ???ｽｯ????????ｽｩ?ｽｳ??ｽｴ?ｽｰ???ｽｪ??ｽｽ?ｽ｢??ｽｼ?????????ｽｮ??????????parameter???ｽｯ??ｽｿ?ｽｽ??????ｽｮ??????ｽｱ????????ｽｮ?????????????ｽｮ???ｽｧ?????ｽ､????ｽｰ?????ｽｮ????ｽｧ????????????ｽｻ??ｽｭ????ｽ｡???ｽｼ???ｽｫ???ｽ｡??????ｽｻ???ｽｼ???ｽｸ???ｽｫ?????????ｽｦ??ｽｽ?ｽｿ???????????ｽｾ??????ｽｻ?ｽ･??ｽｸ????ｽｫ??ｽ､?ｽｺ??????

• text/plain; charset=iso-2022-jp; format=flowed; delsp=yes??ｽｼ???????ｽｬ???ｽｼ???ｽｳ??????ｽｭ???ｽｹ??????ISO-2022-JP???RFCﾂ?3676 ???ｽｧ??ｽｦ???ｽｮ??????????flowed?????????ｽｳdelsp???ｽｮ?????ｽｭ????????????ｽｿ???????ｽｦ?????????ｽｩ???ｽｨ??ｽｼ?
• text/html; charset=UTF-8??ｽｼ?HTML??????ｽｭ???ｽｹ??????UTF-8??ｽｼ?
• multipart/alternative??ｽｼ?HTML???ｽ｡???ｽｼ???ｽｫ???ｽｫ?????????ｽｦ???HTML???ｽｫ?????????ｽ｡??????ｽｻ???ｽｼ???ｽｸ???ｽｨ?????ｽｭ????ｽｮ??????ｽｬ???ｽｼ???ｽｳ??????ｽｭ???ｽｹ??????ｽｫ?????????ｽ｡??????ｽｻ???ｽｼ???ｽｸ??????ｽｨ????????????ｽｴ??????ｽｮ?????????ｽｫ???????????????ｽｱ??????ｽｰ???ｽｪ?????ｽｽ?ｽ｢??ｽｼ????ｽｧ??ｽ｡?ｽｨ????????????ｽｫ?????????ｽｼ?????ｽｼ?

type??ｽｯ????ｽｫ???ｽｪ???ｽ･???ｽｮsubtype???ｽｮ???ｽｱ????????ｽｦ???ｽｮ??????????ｽｦ??????????????ｽｿ?ｽ｡???ｽｴ???ｽｯ???ｽｪ??????ｽｮ???ｽｱ??????ｽｪ???subtype???ｽｧ??????ｽ｣???ｽｦ????????ｽｽ???????ｽｮ?????????ｽｱ?????????ｽｯ???ｽｽ???ｽｨ???ｽｪ??????text ???ｽｮ???ｽｴ??????ｽｯ text/plain???application/octet-stream???multipart ???ｽｮ???ｽｴ??????ｽｯ multipart/mixed ???ｽｧ?????????application???image???audio???video???ｽｪ???ｽｩ???ｽｯ??????ｽｪ???ｽ･???ｽｮsubtype???ｽｫ???ｽ､??????ｽｦapplication/octet-stream???ｽｨ??????ｽｦ???ｽｱ???????????ｽｦ???ｽｮ???????ｽｦ?????????

MIME???ｽｧ???ｽｯUS-ASCII?????????ｽｧ???ｽｪ?????????ｽｼ???ｽｿ???ｽｮ??????ｽｾ??????ｽｾ???ｽｪ??ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｳ????ｽｮ?????ｽｮ??????????ｽｮ????????????ｽｧ???ｽｯ???ｽｽ???ｽｫ???ｽｪ???ｽ｣???ｽｦ????????? ???ｽｸ??ｽｼ????ｽｯ??ｽｻ?ｽ･??ｽｸ????ｽｮ?????????

Content-Transfer-Encoding: mechanism

mechanism???ｽｨ??????ｽｦ???7bit???8bit???binary???quoted-printable???base64 ????????ｽｮ????ｽｧ???????????ｽｸ????ｽｬ??????ｽｫ???ｽｩ???ｽｨ???ｽｧ?????????ｽｮ???ｽｯ 7bit???quoted-printable???base64 ???ｽｧ?????????8bit???binary ???ｽｯ??ｽｸ???ｽｮ????ｽｮ???ｽ｡??ｽｻ?ｽｶ?????ｽｺ??????????ｽｴ????????????ｽｩ???ｽｨ???ｽｧ??????ｽｪ??????

?????????ｽｩ???ｽｫ??????ｽ､???7 ????????????ｽｮ??????ｽｭ???ｽｹ????????ｽ｡?ｽｨ??????Content-Transfer-Encoding ???????????????ｽ｣???ｽｼ???ｽｫ????????????ｽ･?????????ｽｴ??????ｽｯ?????????ｽｮ 7bit ????????ｽｮ??????????ｽｮ???ｽｨ????????????ｽｳ???ｽｨ???ｽｪ??????US-ASCII???ISO-2022-JP???ｽｯ??ｽ｢?ｽｺ??ｽｮ????ｽｫ7 ????????????ｽｮ??????ｽｭ???ｽｹ??????ｽｧ????????????????????????ｽｫ????????????

8 ????????????ｽｮ??????ｽｭ???ｽｹ????????ｽ｡?ｽｨ?????? RFCﾂ?5322 (???ｽｧRFCﾂ?822???RFCﾂ?2822)???ｽｯ7 ????????????ｽｮ??????ｽｭ???ｽｹ???????????????ｽｨ??????ｽｦ???????????????ｽｮ8bit???ｽｯ??????ｽｳ??????ｽｫ??????????????????ｽｮ???ｽｧ????????????ｽ｡???ｽｼ???ｽｫ?????ｽｻ?ｽ｢??????????????????ｽｮSMTP???ｽｯ???ｽｺ???ｽｬ??????ｽｫ7 ????????????ｽｮ??????ｽｭ???ｽｹ???????????ｽｻ?ｽ｢??????ｽｧ??????ｽｪ??????????????????ｽｮ???ｽｨ???ｽｳ???ｽｳ???ｽｼ??????ｽ｣???ｽｳ???ｽｰ??????ｽｨ????????????ｽｨ???ｽｯ???ｽｧ??????ｽｪ??????RFCﾂ?1652???ｽｧ??ｽｮ???ｽｾ?ｽｩ?????????SMTP???ｽｮ???ｽ｡??ｽｼ?ｽｵ(ESMTP)???ｽｮ8BITMIME??????ｽｨ????????????8 ??????????????ｽｨ?ｽｱ??ｽｮ?ｽｹ???????????????ｽｪ???ｽｨ??????ｽ･???ｽｮ??????ｽｭ??????ｽｳ???ｽｫ??????ｽｨ?????????ｽｴ??????ｽｮ???ｽｿ??????ｽｩ???ｽｨ??????ｽｯ???ｽｽ???ｽｧ?????????

??????ｽｼ???ｽｿ?????????ｽｭ???ｽｹ??????ｽｧ???ｽｯ???ｽｪ?????????ｽ､??????ｽｪ???ｽｧ????????????ｽｨ?????ｽ｡?ｽｨ??????RFCﾂ?5322 (???ｽｧRFCﾂ?822???RFCﾂ?2822)???ｽｯ??????ｽｭ???ｽｹ???????????????ｽｨ??????ｽｦ???????????????ｽｮbinary???ｽｯ??????ｽｳ??????ｽｫ??????????????????ｽｮ???ｽｧ?????????SMTP???ｽｯ???ｽｺ???ｽｬ??????ｽｫ??ｽ｡??????ｽｽ????ｽｧ??????ｽｼ???ｽｿ??????ｽｱ??????????????ｽ｡????ｽｮ??ｽｦ???ｽｿ?ｽｵ?????????ｽｪ?????????ｽ､??????ｽｪ???ｽｯ??ｽｻ?ｽ｢??????ｽｧ??????ｽｪ??????RFCﾂ?3030???ｽｧ??ｽｮ???ｽｾ?ｽｩ?????????ESMTP???ｽｮ1???ｽ､???ｽｧ??????BINARYMIME??????ｽｨ??????????????????ｽ､??????ｽｪ?????ｽｨ?ｽｱ??ｽｮ?ｽｹ???????????????ｽｪ???ｽｨ??????ｽ･???ｽｮ??????ｽｭ??????ｽｳ???ｽｫ??????ｽｨ?????????ｽｴ??????ｽｮ???ｽｿ??????ｽｩ???ｽｨ??????ｽｯ???ｽｽ???ｽｧ?????????

US-ASCII???ｽｫ??ｽｭ????ｽｨ???????????ｽｭ????ｽｯ??????ｽｮ???ｽｾ???ｽｾ??ｽｽ?ｽｿ????????ｽｭ????ｽｨ??????ｽｪ????????ｽｭ????ｽｪ???ｽｩ??? =HH???ｽｮ?????????ｽｪ??ｽｽ?ｽ｢???ｽｧ??ｽｬ?ｽｦ???ｽｷ?????????????????????ｽｧ???HH ???ｽｫ???ｽｯ?????ｽｭ????ｽｮ???ｽｳ???ｽｼ????????ｽ､?ｽｧ?????ｽｭ????ｽｮ16???ｽｲ???ｽｰ???ｽｧ?????ｽｮ????????????????ｽｮ??ｽｻ??????ｽｻ?ｽ･??ｽｸ????ｽｮ?????????ｽｪ??ｽｦ????????????????

• = ???ｽｪ??ｽｽ????ｽｯ =3D ???ｽｨ???ｽｪ??????
• ??ｽ｡????ｽｫ???ｽｫ??ｽｩ?ｽｺ???ｽｽ????????????ｽｴ????????ｽｼ???????ｽｮ?????ｽｨ????ｽｧ??ｽ､?ｽｱ????????????????????????????????????=20 ???ｽｨ??????ｽｦ???????????ｽｿ???ｽｭ??????????
• ???ｽｨ???ｽｳ???ｽｳ???ｽｼ??????ｽｮ?????ｽｨ????ｽｧ??ｽ｡????????????ｽｿ??????ｽｼ????ｽｹ??ｽ｡???????ｽｿ???ｽ･????????ｽｼ????ｽｴ??????= ???ｽｨ???ｽｹ??ｽ｡????ｽｮ??ｽｵ????ｽｿ???????????????ｽｿ???ｽ･????????????ｽｨ??????ｽｨ??????ｽ｣??????ｽｹ??ｽ｡????ｽｨ???ｽｺ???ｽ･???ｽｧ???????????????ｽｫ?????????

???ｽｨ???ｽｼ???ｽｭ????????ｽｳ?ｽｻ???ｽｮ??ｽｨ???ｽｪ????ｽｧ???ｽｯ?????ｽ､???????ｽｮ?????ｽｭ????US-ASCII???ｽｨ?????ｽｸ????ｽｧ??ｽｸ????ｽｨ???ｽｫ???ｽｬ???ｽｪ???ｽｮ?????ｽｭ??????ｽｽ?ｽｿ???ｽ｣???ｽｦ????????????ｽｮ?????ｽ､??????? ??????ｽｮ???ｽｴ??????ｽｫ quoted-printable ??????ｽｨ?????????ｽｨ???US-ASCII???ｽｯ??????ｽｮ???ｽｾ???ｽｾ???ｽｮ?????ｽｭ??????ｽｽ?ｽｿ???ｽｨ??????ｽｦ?????????ｽｮ???ｽｧ?????????ｽｼ???ｽｿ??????ｽｻ???ｽｨ??????ｽｩ??ｽ､?ｽｧ?????????ｽｪ?????????quoted-pritable ??ｽｯ?ｽｾ??ｽｿ???????ｽｭ???ｽｰ???ｽｩ????????ｽｽ?ｽｿ??????ｽｪ??????ｽｦ????????ｽ､?ｽｧ??ｽｽ????ｽｮ?????ｽｮ?ｽｹ?????ｽｪ?ｽｭ?????????ｽｨ?????????ｽｩ???ｽｹ???????????? ??????????????ｽｸ?ｽｸ???ｽｮ??????ｽ､??????ｽｪ??????ｽｼ???ｽｿ??????Shift_JIS???EUC-JP???ｽｨ??????ｽ｣?????ｽｻ?ｽｮ?????ｽｼ?ｽ｢??ｽｭ????ｽｪ???ｽｩ???ｽｮ??????ｽｨ???ｽｼ???ｽｭ????????ｽｳ?ｽｻ???ｽｮ?????ｽｭ????ｽｮ??????ｽｭ???ｽｹ?????????ｽｼ???ｽｿ???ｽｫ quoted-printable ??????ｽｩ???ｽｨ?????????ｽｴ??????ｽｯ???base64?????ｽｽ?ｽｿ???ｽｨ?????????ｽｴ??????????????ｽ､?ｽｧ??ｽｹ????ｽｫ??????ｽｼ???ｽｿ?????ｽ､?ｽｧ?????????ｽｪ??????

3???ｽｪ???ｽｯ???????????ｽｼ?24 ???????????ｽｼ????6 ???????????????ｽ､4???ｽ､???ｽｫ??????ｽｲ?????????6 ????????????ｽｮ???ｽ､???ｽｫ??ｽｯ?ｽｾ??????ｽｦ????????????US-ASCII???ｽｮ64 ?????ｽｭ???ｽｼ????ｽｱ??ｽｭ?52 ?????ｽｭ???????ｽｰ??ｽｭ?10 ?????ｽｭ???????+?????????/?????ｽｼ???????ｽｲ?????ｽｽ????ｽｦ?????ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｼ????

??????ｽｮ??ｽｬ?ｽｦ???ｽｷ??????ｽｫ??????ｽ｣???ｽｦ???SMTP???ｽｪ???ｽｩUS-ASCII????????ｽｨ?ｽｱ?????????ｽｦ??????ｽｪ????????ｽｿ?ｽ｡??ｽｷ?ｽｯ???ｽｧ?????????ｽ､??????ｽｪ??????ｽｼ???ｽｿ?????ｽｺ?ｽ､??????ｽｧ?????????ｽ｡???ｽｪ?????????ｽｯ??????????????????ｽｼ???ｽｿ??ｽｮ?ｽｹ??????ｽｯ??ｽｴ?33%??ｽ｢?????????????

??ｽｸ???ｽｨ????ｽｮ????????????ｽｮ??ｽｰ????ｽ･???ｽｫ??????ｽ｣???ｽｦ???body???ｽｨ???ｽｮ??????ｽｼ???ｽｿ???ｽｿ???ｽ､????????ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｼ????ｽｯ?????ｽｮ????ｽｧ???????????????ｽｫ???ｽｪ???ｽ｣???????????????ｽｮ???ｽｾ???ｽｾ???ｽｧ???ｽｯ????????????ｽｨ???ｽｯ???ｽｸ??ｽ､??????????US-ASCII?????????ｽｩ???ｽｨ???ｽｧ??????ｽｪ??????MIME???ｽｧ???ｽｯRFCﾂ?2047???RFCﾂ?2231???ｽｫ??????ｽ｣???ｽｦ???????????????ｽｨ??????ｽｧ???ｽｮ???US-ASCII?????ｽｭ????ｽｮ???ｽｱ????????ｽｦ???ｽｮ???????ｽｦ?????????RFCﾂ?2047???ｽｫ?????????ｽｰ???

=?charset?encoding?encoded-text?=

???ｽｨ????????ｽｽ?ｽ｢??ｽｼ????ｽｫ??????????????ｽｭ????ｽｳ???ｽｼ?????ｽｳ?ｽｻ???charset?????ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｳ????encoding???ｽｧ???encoded-text???ｽｨ??ｽｬ?ｽｦ???ｽｷ?????????????????ｽｪ??????ｽ｡?ｽｨ???ｽｾ???ｽｧ?????????charset???ｽｯ Content-Type:text/plain ???ｽｫ????????? charset ??????ｽｩ???ｽ｡???ｽｼ???ｽｿ???ｽｧ?????ｽｮ??????????ｽｮ???ｽｨ?????????IANA???ｽｫ???ｽｻ???ｽｲ??????????????ｽｭ??????????ｽｨ?????????encoding ???ｽｯ Q ???ｽｾ??????ｽｯ B??ｽｼ???ｽ､?ｽｧ?????ｽｭ????ｽｧ?????ｽｰ??????ｽｭ????ｽｧ???????????ｽｼ????ｽｧ??????????????????ｽｯ???ｽｻ???ｽｼ quoted-printable ???ｽｨ????????ｽｬ?ｽｦ???ｽｷ??????ｽｹ??ｽｳ??????ｽｾ???????ｽｯ base64??????ｽｨ????????????ｽｨ?????ｽ｡?ｽｨ??????

• RFCﾂ?2047???ｽｧ???ｽｯ??????"??????ｽｧ???ｽｲ???ｽｾ????????ｽｸ?ｽｭ???ｽｧ??????ｽｮ?????????ｽｪ??ｽｬ?ｽｦ???ｽｷ?????????????????ｽｪ??????ｽｧ?ｽ｣???????????????ｽｨ???ｽｯ???ｽｧ??????ｽｪ?????????ｽｨ?????????ｽｦ?????????????????????ｽ｣???ｽｦ??????"=?ISO-2022-JP?B?GyRCRnxLXDhsGyhC?="??????ｽｯ???=?ISO-2022-JP?B?GyRCRnxLXDhsGyhC?=??????ｽｨ??ｽｧ?ｽ｣?????????ｽｪ?????????ｽｰ???ｽｪ????????????????????????ｽ･???ｽｬ??ｽｪ???????ｽｨ??ｽｧ?ｽ｣???????????????ｽｨ???ｽｯ?????ｽｦ????ｽｼ?????????ｽｨ???ｽｪ??????????????????Microsoft Outlook Express???ｽｪ???ｽｩ?????ｽｸ????ｽｨ???ｽｮMUA?????????ｽｮ?????????ｽｪ??ｽｪ?ｽ､???ｽ｣?????ｽｬ?ｽｦ???ｽｷ????????ｽｮ???ｽ｣???????ｽｦ????????????ｽｮ?????????ｽｦ??????ｽｾ???ｽ｣???????????????????????ｽｦ????ｽｼ?????????ｽｨ???ｽ･???ｽ｣???ｽｦ??????MUA???ｽｮ??ｽｽ???????????????????ｽｫ??ｽｯ?ｽｾ??ｽｿ?????????????ｽｨ?????ｽｽ???????ｽｪ????????????ｽｦ?????????

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• MHTML (MIME Encapsulation of Aggregate HTML Documents)
• S/MIME (Secure / Multipurpose Internet Mail Extensions)