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Beware duplicate mail()’s in PHP/Firefox

Strangely, invoking the PHP SMTP mail() function after outputting any HTML within a PHP page will cause Firefox to intepret the PHP command twice, thereby sending out 2 duplicate emails. This was happening using PHP5, FF1.5, and Windows IIS6. The issue is fixed by simply placing the mail() command as the first part of any script, before any headers or output are called. I cannot ascertain yet why this is occurring. Any ideas, anyone?