Dont send attachments to the mailing lists.
Give some url link to your image.
eg : you may post the same image to your blog/flickr/picasa/etc and
then you can give that image url.
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Regards,
Arulalan.T
Kanchi Linux User Group Rocks !
http://kanchilug.wordpress.com
My Experiments In Linux are here
http://tuxcoder.wordpress.com