How the front end (mobile) sends HTML files using mailto protocol

how does the front end (mobile) use mailto to send HTML files or be able to send pictures in e-mail? To ensure compatibility, it should be opened in domestic conventional browsers such as qq,163.

Mar.13,2021

has no attachment attribute. Using html mail cannot be displayed in QQ Mail.
A html email by Ruan Yifeng http://www.ruanyifeng.com/blo.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e4533f-4384f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e4533f-4384f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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