昨日の例で具体的に何が返されるかです。
MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: text/plain
abc
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123
--123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
abc
Content-Type: text/plain
xyz
Content-Type: application/octet-stream
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain 123
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain 123
MIME-Version: 1.0 Content-Type: message/rfc822
MIME-Version: 1.0 Content-Type: text/plain 123
MIME-Version: 1.0 Content-Type: text/plain 123
MIME-Version: 1.0 Content-Type: text/plain
123
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123
--123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: text/plain
abc
Content-Type: message/rfc822
xyz
Content-Type: application/octet-stream
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: message/rfc822
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: message/rfc822
MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: text/plain abc
MIME-Version: 1.0 Content-Type: text/plain
abc
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: message/rfc822
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123
--123 Content-Type: text/plain abc --123 Content-Type: application/octet-stream xyz --123--
abc
Content-Type: text/plain
xyz
Content-Type: application/octet-stream
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc-- --123 Content-Type: application/octet-stream rrr --123--
MIME-Version: 1.0 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc-- --123 Content-Type: application/octet-stream rrr --123--
MIME-Version: 1.0 Content-Type: message/rfc822
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc-- --123 Content-Type: application/octet-stream rrr --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123 --123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc-- --123 Content-Type: application/octet-stream rrr --123--
MIME-Version: 1.0 Content-Type: multipart/mixed; boundary=123
--123 Content-Type: message/rfc822 MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc-- --123 Content-Type: application/octet-stream rrr --123--
MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc --abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc--
MIME-Version: 1.0 Content-Type: multipart/related; boundary=abc
--abc Content-Type: text/plain abc --abc Content-Type: image/jpeg xyz --abc--
Content-Type: message/rfc822
abc
Content-Type: text/plain
xyz
Content-Type: image/jpeg
rrr
Content-Type: application/octet-stream