Description:
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In all PHP Versions except 5.3.2 the following Script will return false for FILTER_VALIDATE_EMAIL while FILTER_SANITIZE_EMAIL does NOTHING to the input email.

While the Provided email is a valid return path, i excpect that VALIDATE_EMAIL will return the string provided and not false.

Test script:
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<?php

$email = '3e9.1c.4UB2NC76N436-3SP03.test-EW3LBM-M6H4BG-0-1.mobil.123456.989=test.de@smtp20.test.com';
var_dump(\filter_var($email, FILTER_VALIDATE_EMAIL));
var_dump($email === \filter_var($email, FILTER_SANITIZE_EMAIL));

Expected result:
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string(89) "3e9.1c.4UB2NC76N436-3SP03.test-EW3LBM-M6H4BG-0-1.mobil.123456.989=test.de@smtp20.test.com"
bool(true)

Actual result:
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bool(false)
bool(true)