There is an server exception when some rules like ClamAV are saved using reply email. Check link to see the complete problem report.
Marcelo Angel Marmol
ALTER TABLE `mxhero`.`features_rules_properties` CHANGE COLUMN `property_value` `property_value` TEXT NOT NULL ;
Just run this alter table on the mxhero database.
The problem was that after the new HTML reply message upgrade I forgot to add the script to the database. So installing 1.3.1.RELEASE from 0 gives this kind of problems.