AddThis

Dynamic Email Subject and message

I want to submit dynamic subject and descriptions to email template.
<div class="addthis_toolbox addthis_default_style" addthis:url="{$GLOBALS.site_url}/display-job/{$listing.id}/{$listing.Title|regex_replace:"/[\\/\\\:*?\"<>|%#$\s]/":"-"}.html?searchId={$searchId}&amp;page={$listing_search.current_page}"
addthis:title="Social media jobs: {if $listing.user.CompanyName}{$listing.user.CompanyName}{elseif $listing.company_name}{$listing.company_name}{else}{$listing.user.CompanyName}{/if} is looking for a {$listing.Title} {if $listing.City} in {$listing.City} {/if}{if $listing.State}, {$listing.State}{/if} #socialmedia #jobs"
>
<a class="addthis_button_preferred_1"></a>
<a class="addthis_button_preferred_2"></a>
<a class="addthis_button_preferred_3"></a>
<a class="addthis_button_preferred_4"></a>
<a class="addthis_button_compact"></a>
<a class="addthis_counter addthis_bubble_style"></a>
<script type="text/javascript">
{literal}
var addthis_share = {
email_vars: { CustomDesc: "{/literal}{if $listing.user.CompanyName}{$listing.user.CompanyName}{elseif $listing.company_name}{$listing.company_name}{else}{$listing.user.CompanyName}{/if} is looking for a {$listing.Title} {if $listing.City} in {$listing.City} {/if}{if $listing.State}, {$listing.State}{/if}{literal}", CustomSubject: "{/literal}{$listing.Title} - {if $listing.user.CompanyName}{$listing.user.CompanyName}{elseif $listing.company_name}{$listing.company_name}{else}{$listing.user.CompanyName}{/if}{literal}"}
};
{/literal}
</script>
</div>

This part contained in a "for loop".I have used smarty template.Please help me to send dynamic subject and descriptions.