A new version of Movable Type has been released to fix a vulnerability that allowed attackers to send mail via your machine. You can get the upgrade here and the changelog is here.
Annoyingly this does not fix the known problem with email notifications not working so this is the 2nd release from Movable Type that has this bug and requires you to fiddle the source to fix it. You can read this forum posting for details of fixing the email bug.
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