How can I ensure blocked emails are automatically deleted?

I found that the formatting of the original spam in the Subject is not copied to Mail. I tried to create a rule using the spam's Subject in Mail and just used Delete and it didn't budge. I went to the emails provider and copied the Subject and pasted into a new rule and used Delete. This time it deleted.

I block on a constant basis, but the spam keeps coming from spam machines, because the spammer changes the email addy that they are sending the spam from. It has the same Subject and even when I was using the Gmail interface it is virtually impossible to stop it. I have got rid of email addys because of this.

Spammers change the email they use on a constant basis for spamming. You can block a email today and get the same spam tomorrow with almost the same spam subject Sure block the address and it goes into Trash. Why not just have it deleted. That is why I say blocking is pretty much useless. Now you have create a rule for every spam message you get. If it was just deleted it would save a a lot of time.

Blocking is useless, to put it simply in Mail. It does work in Messages for phone numbers that you block and on cellphones to block obnoxious tell-marketers.