userSMIMECertificate

From PALDAP

An S/MIME [RFC1847] signed message with a zero-length body. This attribute is to be stored and requested in binary form, as "userSMIMECertificate;binary". It contains the person's entire certificate chain and the signed attribute that describes their algorithm capabilities, stored as binary data. If available, this attribute is preferred over the userCertificate attribute for S/MIME applications.

The userSMIMECertificate (User S/MIME Certificate) attribute type is defined in RFC 2798, section 5.8.

[edit] AttributeTypeDefinition

( 2.16.840.1.113730.3.1.40 NAME 'userSMIMECertificate'
  DESC 'signed message used to support S/MIME' 
  SYNTAX 1.3.6.1.4.1.1466.115.121.1.5 
)