If you think about the path that messages take, the queue manager's area of responsibility is the entire area from where the cleanup daemon ends to the end of the queue. It comes into play to determine how a message reaches the recipient. ![]() The queue manager (qmgr) takes responsibility for the delivery of messages. Finally, the queue manager is notified of the incoming messages. Here, when the cleanup job is finished, the message is sent back to the queue. The cleanup daemon handles the rewriting of used messages.At this stage, messages sent from Sendmail, smtpd, and qmqpd meet at a common point and follow the same route. The pickup daemon forwards the incoming message to the cleanup daemon.First of all, Sendmail forwards the mails to the postdrop program, which you can see in the Postfix diagram above. ![]() The working system of Sendmail is as follows: ![]() SMTP is more popular than QMQP and uses the smtpd daemon. One of them is QMQP, which uses the qmqpd daemon. Considering the path messages follow in the Postfix system, there are three different ways this can happen.
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May 2023
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