Postie Plugin
From Joseph Luis Wiki
As Oct. 2012 the Postie Plugin required the following change in postie_getmail.php
if(preg_match("@((%3C|<)/?script|<meta|document\.|\.cookie|\.createElement|onload\s*=|(eval|base64)\()@is",$email)){ echo "possible XSS attack - ignoring email\n"; continue; }