firstly i have tried by using the sendmail pipe there it worked perfectly and i was able to send mail but when i am using the module i am getting the error.

It's not quite clear what do you mean by that sentence. Do you mean that the Mail::Sendmail module doesn't work under your cgi script although it works as normal Perl script?

If so perhaps your problem is that your script doesn't recognize the module. You can try to direct the location of your perl modules with .htaccess.

In a .htaccess file, put

SetEnv PERL5LIB /where/the/mods/are/:/where/else/lib
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Then get your script going, by the following snippet.

#!/usr/bin/perl -w
use CGI ':standard';

# Newly inserted
BEGIN {
    if ( $ENV{PERL5LIB} and $ENV{PERL5LIB} =~ /^(.*)$/ ) {

        # Blindly untaint.  Taintchecking is to protect
        # from Web data; 
        # the environment is under our control.
        eval "use lib '$_';" foreach ( 
            reverse
            split( /:/, $1 )          
        );
    }
}

use Mail::Sendmail;

# The rest of the script....
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