I found a solution to this. I changed the syntax of mailAlternateAddress: olcAttributeTypes: {2}( 2.16.840.1.113730.3.1.13 NAME 'mailAlternateAddress' D ESC 'iPlanet defined attribute type' EQUALITY caseIgnoreIA5Match SUBSTR cas eIgnoreIA5SubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} X-ORIG IN 'iPlanet Messaging Server' ) Seems to work OK. CP