DSBL is GONE and highly unlikely to return. Please remove it from your mail server configuration.
Checked 1.4.19 and 1.4.20-svn. Both had dsbl.org in filters.php
This bug has been resolved in both 1.4.20 [SVN] and 1.5.2 [SVN].
Please pull the latest version from the appropriate development
tree repository to fix your bug.
Thank you for your help in resolving this issue.