So you are saying you want to block mails addressed to you and from you. Is that the case? But some how not to mistake the ones you actually send yourself.

I receive a lot of spam from the same source and I would like to block emails I receive from there. These emails do not have an Unsubscribe button. Also, the Sender and Receiver have the same email address. So. if I were to use an app which would block these emails, I would be blocking myself because I am both the Sender and the Receiver according to these emails.. When I send out an email, obviously I do not address it to the same address as mine. Hope this is clear. Thank you.