Cannot sent emails without a valit account

My “From” says that there is no account but, in tool/accounts it shows the one that i am receiving emails from. Why isn’t my account listed to sent emails?

Open the account settings, tab SMTP and check if this service is enabled.

from tools/accounts there are only 3 tabs “General, IMAP, Diagnostics” available.

In that case try to create the same account again and make sure you configure the SMTP server properly.