Blocking the sender isnt going to do much good as the spammers just keep getting new email addresses for themselves & keep using yours.
If you have OE, try this:
Go to the Message menu & choose Create Rule from Message.
In box 1, de-select what already checked & check Where the Subject line contains specific words (or where the message body contains . . .)
In box 2, check either Delete It or Delete from Server (scroll down to find that one).
In box 3, click contains specific words.
A new window pops up. Type the offensive word in the 1st box, click Add & repeat with any other words you want to avoid. Then click OK.
Also in box 3, click the word And and choose Messages match any one of the criteria from the new Window. Then click OK in both windows.
Be careful with the Delete from Server item. Your friends may send you something about farm horses that has nothing to do with porn and you might want to see it.
Deleted messages will show up in your Deleted Items folder & it will keep track of how many there are. You can just review who sent the stuff in you delete folder for valid address & avoid seeing them.
Its not fool proof. Ive sometimes gotten stuff that should have been filtered out. Also, I get a news letter from Ancestry.com that for some bizarre reason always gets dumped in the delete folder and no, they dont offer to enhance body parts for me.
Deb