blocking senders of emails in junk mail

I have received emails in my junk folder bearing the sender as “Canadiana ****” and the subject as “Drugstore (Viagara,lavix,****,Lipitor) Secure and Trusted”. I started blocking them using the sweep and block from feature in junk mail, however, that doesn’t seem to work. I continue to receive them. I began documenting them and taking screenshots (without opening them) and noticed that the sender always has the same prefix in the email accounts as “typsfs” and the emails are always .com (evidence of a spammer as any communications from professional organizations or medical field should be .org) How do I stop receiving these emails as I am getting them daily and sometimes hourly? Any help/feedback would be appreciated as I would like to know how to block emails by subject or by prefix of sender?