G mail?

http://gmail.google.com/support/bin/answer.py?answer=8151&query=block&topic=0&type=f&ctx=search

Hm. Linket virker vist kun når man er logget på...
Der står:

While you can’t currently block messages from specific addresses or domains, you can set up a filter to send those unwanted messages directly to Trash.
To set up a filter, follow these steps:


1. Click 'Create a filter' under the search box at the top of any Gmail page.
2. Fill in the appropriate fields with the filter's criteria, and click 'Next Step.'
3. Choose the action you'd like for these messages by checking the appropriate box. (In this case, we suggest checking 'Move it to the Trash.')
4. Click 'Create Filter.'
To edit or disable a filter, click ‘Settings.’

Tak - så logger jeg da bare ind ;) Tak ! :D