IM2000: Architecture

The IM2000 architecture comprises several types of entities that intercommunicate via several types of protocol.

The entities in IM2000

• Originators of messages use originator MUAs to create mail messages.

• Messages are stored in message stores, that are owned by message store owners.

• Message stores send notifications (not the actual messages) to recipient notification agents, which retain them on behalf of recipients.

• Recipients of messages use recipient MUAs to query their recipient notification agents for notifications and then to retrieve the actual messages from the message stores.

The protocols in IM2000

• Originators' MUAs communicate with message stores via the Message Store Originator Access Protocol.

• Recipients' MUAs communicate with message stores via the Message Store Recipient Access Protocol.

• Message stores send notifications to recipient notification agents via the Recipient Notification Agent Submission Protocol.

• Recipients' MUAs communicate with notification agents via the Recipient Notification Agent Query Protocol.

Other things

• A common DNS lookup algorithm is used to locate IM2000 services.

• Security of the IM2000 session authentication mechanisms

• There are PDU rules that are common to all protocols.

• There are common structure and transport layer requirements for all protocols.

The IM2000 Big Picture

,----------------.
| Originator MUA |
`----------------'
        |
      MSOAP
        |
        v
,---------------.             ,------------------------------.
| Message Store |----RNASP--->| Recipient Notification Agent |
`---------------'             `------------------------------'
        ^                                    ^
        |                                    |
      MSRRP                                RNAQP
        |                                    |
        \----------               -----------/
                   \             /
                  ,---------------.
                  | Recipient MUA |
                  `---------------'