OID value: 1.2.840.113549.1.9.16.2.3
OID description:
Mail list expansion processing is noted in the value of the mlExpansionHistory attribute, located in the signed attributes of the MLA's SignerInfo block. The MLA creates or updates the signed mlExpansionHistory attribute value each time the MLA expands and signs a message for members of a mail list.
MLExpansionHistory ::= SEQUENCE SIZE (1..ub-ml-expansion-history) OF MLData ub-ml-expansion-history INTEGER ::= 64 MLData ::= SEQUENCE { mailListIdentifier EntityIdentifier, expansionTime GeneralizedTime, mlReceiptPolicy MLReceiptPolicy OPTIONAL } EntityIdentifier ::= CHOICE { issuerAndSerialNumber IssuerAndSerialNumber, subjectKeyIdentifier SubjectKeyIdentifier } MLReceiptPolicy ::= CHOICE { none [0] NULL, insteadOf [1] SEQUENCE SIZE (1..MAX) OF GeneralNames, inAdditionTo [2] SEQUENCE SIZE (1..MAX) OF GeneralNames }
URL for further info: http://www.ietf.org/rfc/rfc2634
See also the OID Repository website reference for 1.2.840.113549.1.9.16.2.3