My problem has been resolved. the problem was in my theme, in the fuctions. thank you for your support!
As seen in the comment above, the problem has persisted on several sites. Well, I use these plugins. The ones highlighted in red are plugins created by the company and only affect the posttype creation area, nothing related to sending emails. the others you can see in the wordpress store.
Screen1: https://i.imgur.com/AMS2hgQ.png
Screen2: https://i.imgur.com/LvIJIy8.png
Screen3: https://i.imgur.com/iBgJAeS.png
Utilizo o tema flatsome.
After I posted this post, I looked for more about it and I found the serial number, it helped me a lot. Thank you so much for helping me!
