The specific steps to transfer music from Kugou to your mailbox and then send it to another mailbox are as follows:

1. Open Kugou Music on your computer and select the music you want to transfer. Go to the song in another email, right-click and select Download.

2. Select any location you want to save to.

3. After downloading, open your mailbox to write a letter and select "Add Attachment".

4. Browse the folder where the songs were saved just now, and double-click the song you want to transfer.

5. Finally, wait until the song is uploaded and send the email.