Sometimes unsolicited emails to do not come with an Unsubscribe option.
If I send those emails directly to my Spam folder without even opening them, will all emails from the same source go to my Spam folder?
Or is there another, more efficient way to deal with those fuckers?
The unsubscribe option is often a ruse. It allows the emailer to confirm you are real and when you confirm they sell your email address to everyone.
I just seldom provide an email address.
So is it better to send the unwanted email to Spam than to unsubscribe?
You can add a filter and have the emails directly sent to the spam folder. Before I could tell you how to do this I would need to know which site or software you use, e.g. Gmail.