As you know, you can send e-mails to Channels in Teams by using the channel e-mail address you can get by means of Channel settings menu. What’s a little be more hiden are Channel e-mail advanced settings:
In a Teams Channel, just clic on “Get email address” (“Obtener la dirección de correo electrónico”) so the “Get email” PopUp is show. In the PopUp clic on “Advanced settings”.
Then you will see some advanced settings that allow you to configure who can send e-mails to the Teams Channel.