Thunderbird/52.7.0

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I have a question! I need to send MIME-version email but I can't understand how to activate MIME-function to make multipart/alternative message with opportunity to send it in HTML format . I use thunderbird for MACBook. So can u help me, please? There is an example of source: User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="------------EA7E3EDADDA629425836ED71" Content-Language: ru Return-Path: flamingo@flamingo.ru X-Yandex-Forward: 375e4d3ae293e607db4c6173c3ce6625 This is a multi-part message in MIME format. --------------EA7E3EDADDA629425836ED71 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Здравствуйте! Здравствуйте.