Ok So, stupid me, I forgot to mention that I'm dealing with jewel with delay_jobs. So the problem is that I forgot to specify ".deliver!". action after each "mail".
So it should look like this:
mail(:to => @vehicle.owner.email_address, :template_name => "n_o").deliver! mail(:to => @vehicle.booker.email_address, :template_name => "n_b").deliver!
But still. Thank you for your support!
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