My script:
$message = "
<html>
<head>
<title>Birthday Reminders for August</title>
<style>td,tr{border:solid 1px black;}</style>
<meta charset='UTF-8'>
</head>
<body>
<table>
<tr><td>სახელი</td><td>{$_POST['firstname']}</td></tr>
<tr><td>გვარი</td><td>{$_POST['lastname']}</td></tr>
<tr><td>დაბადების თარიღი</td><td>{$_POST['birthday']}</td></tr>
<tr><td>მოქალაქეობა</td><td>{$_POST['cityzen']}</td></tr>
<tr><td>პირადი ნომერი</td><td>{$_POST['id_number']}</td></tr>
</table>
</body>
</html>
";
// To send HTML mail, the Content-type header must be set
//MUSHA
$headers = 'MIME-Version: 1.0' . "
";
$headers .= 'Content-type: text/html; utf-8' . "
";
// Additional headers
$headers .= 'To: Mary <aaa.wwww@gmail.com>, Kelly <kelly@example.com>' . "
";
$headers .= 'From: Birthday Reminder <birthday@example.com>' . "
";
$headers .= 'Cc: birthdayarchive@example.com' . "
";
$headers .= 'Bcc: birthdaycheck@example.com' . "
";
// Mail it
mail($to, $subject, $message, $headers);
I've tested it on gmail.com, yahoo.com, outlook.com and everything works great.
but in MS Outlook it has problem of UTF-8.