From: =?UTF-8?B?Q3JhenkhIMKh4oSiwqPCouKInsKnwrbigKLCqsK6?= <listowner@example.com>
To: =?UTF-8?B?Q3JhenkhIMKh4oSiwqPCouKInsKnwrbigKLCqsK6?= <listemail@example.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed
Content-Transfer-Encoding: 7bit
Mime-Version: 1.0 (Apple Message framework v929.2)
Subject: =?UTF-8?B?Q3JhenkhIMKh4oSiwqPCouKInsKnwrbigKLCqsK6?=

Test.