How the sendmail Program Works
The following sections describe how the sendmail program works.
When a sender wants to send a message, the program issues a request to sendmail. The sendmail program then goes through the steps listed below, which are described in detail in the following sections.
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Arguments are processed and the address is then parsed.
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The message is collected.
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The message is delivered.
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If instructions are received from the mailer, the message is queued for retransmission.
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If errors occur during processing, the message is returned to the sender.
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Argument Processing and Address Parsing
If sendmail is called by means of the argument vector or is connected to through a pipe, the arguments are first scanned and ...
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