Dansk tegnsæt i mail fra form.

function escapeAddr($addr) {
    $check = preg_match('/(.*)<(.*)>/', $addr, $a);
    if ($check) $addr = '=?UTF-8?B?'.base64_encode($a[1]).'?= <'.$a[2].'>';
    return $addr;
}
function mail_utf8($to, $subject='Intet emne', $message='', $from='', $type='plain', $cc='', $bcc='') {
    $from = escapeAddr($from);
    $header = 'From: '.$from.PHP_EOL
            . 'Return-Path: '.$from.PHP_EOL
            . 'Reply-To: '.$from.PHP_EOL
            . 'MIME-Version: 1.0'.PHP_EOL
            . 'Content-Type: text/'.$type.'; charset=UTF-8'.PHP_EOL
            . 'X-Mailer: PHP/'.phpversion().PHP_EOL
            . 'Content-Transfer-Encoding: 8bit'.PHP_EOL;
    if ($cc!='') $header .= 'Cc: '.escapeAddr($cc).PHP_EOL;
    if ($bcc!='') $header .= 'Bcc: '.escapeAddr($bcc).PHP_EOL;
    $header .= PHP_EOL;
    return mail($to, '=?UTF-8?B?'.base64_encode($subject).'?=', $message, $header);
}

// Eksempel på brug:
mail_utf8('modtager@gmail.com', 'Besked til dig', 'Indhold af mail', 'fra@domain.dk', 'html');