Content-Type: multipart/mixed;
 boundary="------------090104020208060008040809"

This is a multi-part message in MIME format.
--------------090104020208060008040809
Content-Type: multipart/alternative;
 boundary="------------030909020408050302070704"


--------------030909020408050302070704
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable


... plain text ...


--------------030909020408050302070704
Content-Type: multipart/related;
 boundary="------------000403070904000609020709"


--------------000403070904000609020709
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

... html text ...

--------------000403070904000609020709

... image inline ...

--------------000403070904000609020709

... image inline ...

--------------000403070904000609020709-- (end multipart/related)

--------------030909020408050302070704-- (end multipart/alternative)

--------------090104020208060008040809

... attach-file ...

--------------090104020208060008040809

... attach-file ...

--------------090104020208060008040809-- (end multipart/mixed)