newsletter - Magento: where can I set some params/vars to "newsletter_subscr_success.html" email template? -

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i need customize "newsletter_subscr_success.html" email template , need pass variables it.

the problem don't know sent can push parameters/variables.

where can find it?

if have variables in controllers files or models or model/observer.php, should in format, 

$emailtemplatevariables['any_string'] = "this string";

now, grab variable newsletter_subscr_success.html, give 

<div>{{var any_string}}</div>
, done!


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