public static function profiles(array $aEmail, $sFormat = null)
    {
        $aProfils = [];

        foreach ($aEmail as $sEmail) {
            $gravatarProfil = (new Profile())
                ->setEmail($sEmail)
                ->setFormat($sFormat);

            $aProfils[$sEmail] = $gravatarProfil;
        }

        return $aProfils;
    }