By default when I compose an e-mail in Gmail, the spell checker is active. To disable it, I need to activate context menu (right click) and select "Check Spelling" option to toggle it off. Is there any way to disable it on a permanent basis, so always when a I start composing an e-mail no spell checking is performed?
Note that there is also spell checking in Gmail. Official usage doc is there : https://support.google.com/mail/answer/7987?hl=en
As far as I know, there is no way to disable. However, it is only shown when you explicitly require it so I don't think it can be bothering at any time.