QQ mailbox supports picture signature. After logging in, click Settings, click HTML from the signature edit box, and then paste the image code. For example, I signed it with my own QQ show, and the code is:

& ltIMG

src = "/ 15 * * * * * */ 10/00/。 jpg " & gt

If you use other network pictures, you can replace the URL in quotation marks with the picture address accordingly.