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First of all, it’s a VERY BAD idea to publish your security salt in a public forum. You should edit this post and delete that information as soon as possible.
Now, to your question:
In your app.php, this:
'className' = 'Smtp'
needs to be this:
'className' => Smtp::class
And in your email delivery profile configuration, change the transport from ‘default’ to ‘Smtp’ so that it will use the transport you set up with your Gmail config.
And is it a good idea to use identical salt with every password ?