Novell Doc: GroupWise 7 - TCP/IP Link Closed: Transfer between Post Offices Delayed

2.2 TCP/IP Link Closed: Transfer between Post Offices Delayed

This message flow diagram illustrates how a GroupWise message travels from one user to another between post offices in the same domain when the TCP/IP link between the post office and the domain is closed.

Figure 2-2 Message Flow When the TCP/IP Link is Closed

Table 2-2 Message Flow When the TCP/IP Link is Closed Stages

Stage	Icon	Description
Sender		The user sends a message to recipients in a different post office in the same domain. In this diagram, the access mode setting in the local post office is Client/Server Only.
Sender’s GroupWise Client		The GroupWise client communicates the message to the POA by way of TCP/IP.
POA for Sender’s Post Office		The POA receives the message from the GroupWise client and performs the following actions for the sender: Adds the message to the message database (msgnnn.db) assigned to the sender. Creates a pointer in the sender’s user database (userxxx.db) so the message appears in the sender’s mailbox as a sent item. Places attachments larger than 2 KB in one of the post_office\offiles\fd0-F6 subdirectories and creates pointers from the message to its attachments. (For database efficiency, messages and distribution lists larger than 2 KB are also handled as attachments.) Creates a copy of the message in the appropriate priority 0-7 subdirectory of the MTA input queue in the sender’s post office, in case the TCP/IP link to the MTA is currently closed.
POA for Sender’s Post Office		The POA then attempts to communicate the message to the MTA by way of TCP/IP, but the MTA does not respond. The POA leaves the copy of the message in the MTA input queue and periodically attempts to contact the MTA. When the MTA responds again, the POA communicates the message and deletes the copy in the MTA input queue after the TCP/IP transmission to the MTA is successful.
MTA for Local Domain		The MTA receives the message and places it into the MTA “in progress” (gwinprog) queue.
MTA for Local Domain		The MTA then communicates the message to the POA in the recipient’s post office by way of TCP/IP. When the transmission is successful, the MTA deletes the message from the MTA “in progress” (gwinprog) queue. If the TCP/IP link to the recipient’s post office is closed, the message is placed in the closed post office’s holding queue in the MTA’s mslocal directory for later transfer. The resulting message flow is parallel to what occurs when a domain is closed. For a similar message flow that illustrates how messages to closed locations are handled, see Section 3.2, TCP/IP Link Closed: Transfer between Domains Delayed.
POA for Recipient’s Post Office		When it receives the new message, the POA for the recipient’s post office performs the following actions: Adds the message to the message database (msgnnn.db) corresponding to the one assigned to the sender. Creates a pointer in the recipient’s user database (userxxx.db) so the new message appears in the recipient’s mailbox and updates the notification information in the user database so the recipient can be notified of the message. Places attachments larger than 2 KB in one of the post_office\offiles\fd0-F6 subdirectories and creates pointers from the message to its attachments. (For database efficiency, messages and distribution lists larger than 2 KB are also handled as attachments.) Creates a Delivered status message in the appropriate priority 0-7 subdirectory of the MTA input queue in the recipient’s post office. It also communicates the Delivered status message directly to the MTA by way of TCP/IP and when that transmission is successful, the copy in the MTA input queue is deleted.
POA for Local Post Office		The POA communicates to the GroupWise client by way of TCP/IP that a new message has arrived.
Recipient’s GroupWise Client		The Notify component of the recipient’s GroupWise client notifies the recipient that a new message has arrived.
Recipient		Each recipient opens the message in the GroupWise client.
Recipient’s GroupWise Client		Each recipient’s GroupWise client communicates the Opened status message to the POA by way of TCP/IP.
POA for Recipient’s Post Office		The POA for the recipient’s post office communicates the status message to the MTA by way of TCP/IP.
MTA for Local Domain		The MTA places the status message into the MTA “in progress” (gwinprog) queue.
MTA for Local Domain		The MTA communicates the status message to the POA for the sender’s post office by way of TCP/IP.
POA in Sender’s Post Office		The POA for the sender’s post office updates the sender’s message database (msgnnn.db) with the Delivered status information (and possibly Opened as well if the recipient has opened the message).
POA for Local Post Office		The POA communicates the Opened status to the sender’s GroupWise client by way of TCP/IP.
Sender		When the sender checks the sent items in his or her mailbox in the GroupWise client, the message displays a status of Delivered for each recipient (and possibly Opened as well if the recipient has opened the message).