From rfc4519:

2.26. 'preferredDeliveryMethod'#

The 'preferredDeliveryMethod' attribute type contains an indication of the preferred method of getting a message to the object. (Source: X.520)

( 2.5.4.28 NAME 'preferredDeliveryMethod' SYNTAX 1.3.6.1.4.1.1466.115.121.1.14 SINGLE-VALUE )

1.3.6.1.4.1.1466.115.121.1.14 refers to the Delivery Method syntax http://tools.ietf.org/html/RFC4517/.

Example#

If the mhs-delivery Delivery Method is preferred over telephone-delivery, which is preferred over all other methods, the value would be: "mhs $ telephone".

More Information#

There might be more information for this subject on one of the following:

• 0.9.2342.19200300.100.4.13
• 2.5.4.28
• 2.5.6.20
• 2.5.6.5
• 2.5.6.7
• 2.5.6.8
• Dmd
• Domain
• LDAP Object Identifier Descriptors
• Organization
• OrganizationalPerson
• OrganizationalUnit

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[#1] - http://tools.ietf.org/html/rfc4519#section-2.26