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Qmail Quickstarter by Kyle Wheeler

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Chapter 2. Getting Email into the Queue

This chapter covers the input end of the qmail mail system. It focuses on the SMTP protocol and related protocols, and the details of how the tcpserver, qmail-smtpd, and qmail-queue programs provide that service.

qmail-queue and the Qmail Queue

The following diagram is a part of the overall structure of qmail described in Chapter 1.

qmail-queue and the Qmail Queue

The only way of getting email into the on-disk queue in qmail is to use the qmail-queue program. This is a simple program with a single task: take an email and store it in the on-disk queue.

Any program can use qmail-queue to inject a message into the queue, provided it can present ...

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