About Ming Dynasty
Android devices do not include the Japanese Mincho font, so even if you specify serif in font-family, it will not become Mincho font.
Also, do not enclose serif in quotation marks. There are some email clients (Thunderbird, Gmail) that do not use Mincho font.
Please refer to the following sources when specifying.
1
<span style="font-family:serif;">serif ABCDE12345 明朝体</span>
PC: Thunderbird, Mac Mail
PC browser: Gmail, Outlook.com
iPhone: Mail app, Gmail app, Yahoo! Mail app
iPhone browser: Gmail, Yahoo! Mail
Mailer that uses Mincho font for alphanumeric bangladesh telegram database characters only (Kanji, Hiragana, and Katakana are Gothic font)
PC: Outlook 2010, Outlook 2013, Outlook 365
Android: Gmail app, Yahoo! Mail app, au Mail app
Android browser: Gmail, Yahoo! Mail
Unsupported mailer
PC browser: Yahoo! Mail
About web fonts
Since the CSS is loaded in the head tag, all email clients that do not support the CSS in the head tag will use the default font.
*The following was verified using Noto Serif JP.