Each is processed in turn.
If the colon is present and if the version of the qf file is greater than 0, the characters
between the R and the colon are interpreted as flags that further define the nature of the
address:
P(primary)
Addresses can undergo many transformations prior to delivery. When expanding
aliases, for example, the address george might be transformed into two addresses via a
~/.forward file: george@here and george@there. In this instance, george is the primary
address, and the aliases are secondary addresses. If aliasing yields only a single transformation,
the single new address is considered primary. Addresses that are received
via an RCPT SMTP command, or on the command line, are always considered
primary, as are all other recipient addressees prior to aliasing.
N(notify)
Recipient addresses can lead to various kinds of notification based on the nature of the
DSN NOTIFY extension to the RCPT SMTP command. That notification can be either
NEVER or some combination of SUCCESS, FAILURE, or DELAY. Internally, sendmail
uses the absence of the latter three to imply NEVER. This N flag simply says that
the DSN NOTIFY extension appeared in the message. If the N is absent, but an S, F, or
D is present, DSN information will not be propagated. Note that NOTIFY can also be
specified by using the -N command-line switch (?§6.
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