Account error for SMTP settings for outgoing email

Currently using GL-X750 Spitz on 3.216 firmware. When trying to set up SMTP settings for outgoing email to forward SMS from, after putting all the information according to the instruction, I press “Apply” button but get red message “Account: error”.
I have tried Gmail, Outlook, and Yahoo, all with the same error messages.
Any ideas?

I can confirm that I get exactly the same error message on Mudi router (GL-E750) as well (also running on 3.216 firmware), regardless of the email server.
I suspect that could be something relevant to 3.216 firmware maybe?

p.s. there is no Protocol section either.

It is a bug and was fixed yesterday.

Please try it with the latest snapshot.

That’s confirmed.
Thank you for the update