"Mail Server Setings" disappeared from my Email channel

"Mail Server Setings" disappeared from my Email channel

I deleted an old email to configure a new one in my Zoho Support interface.
After deleting the old one, the tab where I can configure my mail server has disappeared. Before deleting the mail I can see 4 tabs under Email channel, and now I can see only three.

Can you help me?

Greetings