OID 1.3.6.1.4.1.8057.2.84.7 preferredMail
attributetype ( 1.3.6.1.4.1.8057.2.84.7 NAME ( 'preferredMail' ) DESC 'RFC1274: RFC822 Mailbox' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )