<?php
print_r($xml->htmlText->TEXTFORMAT->P->FONT);

Result:

SimpleXMLElement Object ( [@attributes] => Array ( [FACE] => Arial [SIZE] => 12 [COLOR] => #333333 [LETTERSPACING] => 0 [KERNING] => 0 ) [A] => SimpleXMLElement Object ( [@attributes] => Array ( [HREF] => mailto:some@email.com [TARGET] => ) [U] => some@email.com ) )

echo $xml->htmlText->TEXTFORMAT->P->FONT;

Result:
?>
SOME TEXT SOME TEXT