TRANSFER Programming Manual

Basic Steps for Receiving an X400 Message
X400 Services
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Beyond these basic steps, you can check for service elements in an incoming X400
message. Many service elements rely on the recipient client or UA to enforce the
service or provide part of the service. Such service elements include:
Disclosure of recipients
Grade of delivery
Delivery notification
Nondelivery notification
Receipt notification
The functionality you provide in your client depends on which service elements you
choose to support.
You use standard TRANSFER UOWs to access service element values. For example, to
tell whether an originator requested receipt notification, check the results of the GET-
X400-RECIP UOW. The UOWs used to access each service element depend on the
particular service element and are described in "X400 Gateway Service Elements," later
in this section.
P2 messages can include several service elements that depend on the recipient process
for completion. These elements include receipt notification and blind copy
enforcement. Other service elements contain information about the message, such as
subject text and expiration date. These elements are described later in this section.
Note The gateway does not verify that text fields contain the specified type of text. Similarly, text-oriented fields
are not validated. Therefore, it is possible to receive unexpected data types in incoming text (for example,
binary data in a subject field).