here i am sending some difference between email files.

(1)
original mail part

Content-Type: multipart/mixed;
 boundary="------------080809010202050907080509"

This is a multi-part message in MIME format.
--------------080809010202050907080509
Content-Type: multipart/alternative;
 boundary="------------060805000603060704000609"

--------------060805000603060704000609
[download]

duplicate mailpart

Content-Type: multipart/mixed;
 boundary="------------080809010202050907080509"

This is a multi-part message in MIME format...

--------------080809010202050907080509
Content-Type: multipart/alternative;
 boundary="------------060805000603060704000609"

This is a multi-part message in MIME format...

--------------060805000603060704000609
[download]

(2)
original mail

--------------080809010202050907080509
Content-Type: application/x-gzip;
 name="hi.tar.gz"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
 filename="hi.tar.gz"
[download]

duplicate mail

--------------080809010202050907080509
Content-Type: application/x-gzip;
 name="hi.tar.gz"
Content-Transfer-Encoding: base64
Content-Disposition: inline;
 filename="hi.tar.gz"
MIME-Version: 1.0
X-Mailer: MIME-tools 5.420 (Entity 5.420)
[download]

(3)
original mail part

This is a multi-part message in MIME format.

------_=_NextPart_001_01C92D01.A2C75F1A
Content-Type: multipart/alternative;
    boundary="----_=_NextPart_002_01C92D01.A2C75F1A"


------_=_NextPart_002_01C92D01.A2C75F1A
Content-Type: text/plain;
[download]

duplicate mail

This is a multi-part message in MIME format...

------_=_NextPart_001_01C92D01.A2C75F1A
Content-Type: multipart/alternative;
    boundary="----_=_NextPart_002_01C92D01.A2C75F1A"

This is a multi-part message in MIME format...

------_=_NextPart_002_01C92D01.A2C75F1A
Content-Type: text/plain;
[download]

and i got some empty boundraries like

Content-Type: multipart/alternative;
    boundary="----_=_NextPart_002_01C92D01.A2C75F1A"

------_=_NextPart_002_01C92D01.A2C75F1A
[download]

so can u suggest me some changes or in code so it will not increase the size of duplicate mail(upto 4-5 kb its okey)
Thanks