The data in be.surbl.org, originally from Chris Santerre's BigEvil SpamAssassin ruleset, is stale and has been superceded by ws.surbl.org for a long time now, so we will be shutting down DNS service for it in one month, at the end of November.
Please update your configurations to use multi.surbl.org (strongly preferred) or ws.surbl.org instead.
http://www.surbl.org/lists.html
This change should only be necessary for folks who manually configured their applications to use be.surbl.org. Default installations of SpamAssassin and other SURBL-using applications should be using multi and the appropriately encoded lists already.
Cheers,
Jeff C.