Thanks roboticus. I have modified my function and now I'm able to get both body message as well as attachment in mail. Function Code: 
sub sendmailto {
             $mailing_list = $_[0];
             $subject = $_[1];
             $message = $_[2];
             $from = "naga.rajan@gmail.com"
             $attachment = `uuencode "/home/naga/testing-scripts/Packa
+ge_Specification_Document.doc" "Package_Specification_Document.doc"
        open (MAIL, "|mailx -s "$subject\" -r $from $mailing_list");
        print MAIL "Hi, \n";
        print MAIL "\n";
        print MAIL "This email was sent using an automated email syste
+m. Please do not reply, or forward to this email otherwise your messa
+ge will not reach your intended recipients. \n";
        print MAIL "If you like to contact us pleas write to *UNIX Tea
+m. \n";
        print MAIL "\n";
        print MAIL "Regards, \n";
        print MAIL "UNIX Team \n";
        print MAIL "\n";
        print MAIL "\n";
        print MAIL "$message";
        print MAIL $attachment;
close MAIL;
}

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If I paste  print MAIL $attachment; next to mailx  open (MAIL, "|mailx -s "$subject\" -r $from $mailing_list"); then body content is getting missed. If we paste before closing MAIL file handler then we are able to get both body message as well as attachment in mail.

In reply to Re^2: body content is missing while sending mail with attachment by bheeshmaraja
in thread body content is missing while sending mail with attachment by bheeshmaraja

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