SMTP/JNI Processing Diagram

Database

Server

Java

Handlers

5. Processed message is stored in the database

sendmail

C++

delivery

agent

2. Sendmail starts delivery agent

1. Message is received by sendmail

JNI DLL coordinates access to shared memory buffers used by the IPC mechanism

3. Agent locates an available Handler, copies the message and signals completion

4. The signal releases the blocked Handler to process the message

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