Configuring mail to detect spam

Question

Hello.. I am geting mail from two or three companies to  whom i have politely requested that they remoe my e mail address from their database .(fat chance)
i want to set my mail program to filter out mails from these two or three ( maybe more in future) e mail addresses.
i have tried to be diligent to see if the question has been asked before.
i found this
response on one
Choose Mail > Preferences, and then click Junk Mail.
Specify which actions Mail should perform when junk mail arrives.
When you want to verify what Mail is identifying as junk mail, select the “Mark as junk mail, but leave it in my Inbox” checkbox.
When you are sure the filter is accurately identifying junk mail, select the “Move it to the Junk mailbox” checkbox.
********** To set up other actions, select the “Perform custom actions” checkbox, and then click the Advanced button. In the pane that appears, click Add to add conditions and actions. To remove a condition or action, click Remove (-). Note: To use the junk mail database when identifying junk mail, make sure “Message is Junk Mail” is one of the conditions (it’s specified by default). Otherwise, Mail uses only the conditions listed to identify junk mail.
in this area, is there a place when i click perform custom actions and then click on advanced button and in the condition or action, add somehow, to place these e mail addresses on the junk database..
is there any other way to put specific e mail addresses in some kind of junk alert database for the mail program.

Answer 1

sorry, folks.. i am very dense when it comes to these things.
i found rules.. but it is in a different place in "preferences" from" junk."
maybe that does not matter.
but when , after clicking on "rules",
the 'rules pane comes up, and i see a + sign, do i click the plus sign and then
in the criteria, add the offending e mail address under 'contains'..
what if there is more than one e mail address which i want rules to deal with?  I guess i would click the plus + sign again and do each one seperately?
and 'move to trash' as "action taken".?
does this happen automatically every time mail receives a message which i have listed under rules action taken move to trash.?
This may seem like i am rather an idiot, but i find that i have to double check everything and not take anything for granted...when it comes to using computers.
thank you for your patience, y'all.
I will try Jeffreys trick also
i was so diligent in removing the offending trash when I received it, that i have to wait until tomorrow to try all of this.
but i wanted to get the complete instructions now.
i will mark that both answers helped me..thank you
ali