Mime email

[yudasy]

i create script email sender with mime email.. and i test in my email address..when i open in outlook express..this message is
not correctly like this:

Content-Type: multipart/alternative;
boundary="----894cae0d5c97ec553d3a7f8a9c03ed61"

------894cae0d5c97ec553d3a7f8a9c03ed61
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit

testing
------894cae0d5c97ec553d3a7f8a9c03ed61
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: 8bit

testing
------894cae0d5c97ec553d3a7f8a9c03ed61--

why..if someone know this problem give me solution and send with my email address [e-mail]
thank's

Yuda