That's right. I changed it and remove it. Forgot to tell it. I changed it and remove this line - same result.
Also I've put here screenshot from Invision Community phpinfo.
What I did right now- I've used Support section in admin panel, disable all customization, default theme was showed - same result.
I checked .htaccess if there is not line that is changing something but now. I didn't touch it.
Honestly - that's the only option that is not working. I wanted to switch it from smtp (because of mail's limit)