How does the Lotus Notes Mail Server works?

This is a tool to send mail from Notes to Exchange and vice versa.The connector basically changes the mail format at the junction which is the connector itself.
Mail Flow from Notes to Exchange

1.A Lotus Notes/Domino user sends mail that is addressed to an Exchange mailbox owner. The Notes system should be configured to recognize the Exchange system as a "Foreign Domain". The Lotus Notes Mail Router should deposit the mail into the Exchange.box (this is the default name) database on the Lotus Notes server.

2.Lsntsmex.exe pulls the mail from the Notes' Exchange.box, converts it from Notes format to Exchange MAPI format by using the Lotus Notes API, and then puts it in the Notes Mail Connector's READY-IN MAPI folder.

3.Lsmexin.exe performs address translation and Active Directory lookup for the intended recipient. It then moves the mail from the READY-IN folder to the MTS-IN folder.

4.Store.exe (MSExchangeIS service) moves the mail to the Message Transfer Agent (MTA, Emsmta.exe), and then the MTA puts the mail on the MTA's SMTP queue, which is viewable under the server's X400 Queues in Exchange System Manager (ESM).

5.Store.exe picks up the mail from the MTA and puts it on the SMTP Service's MTS-OUT queue.
Note This queue is only viewable in Performance Monitor/System Monitor.

6.SMTP categorizes and routes the mail to the target recipient(s).