The
second form shows the recipient address being parsed from the headers in the file. And the
third form shows the recipient being taken from an SMTP session run via standard input
and output.
Regardless of how you submit messages to sendmail, on the command line or with -bs, it is
still considered direct submission. When a message is directly submitted it is of a different
nature than a message received over a socket. When a message is directly submitted, the
${daemon_flags} sendmail macro (?§21.9.33 on page 818) is given one of two possible sets of
values. If the -G command-line switch(?§6.7.25 on page 242), whichspecifies gateway
submission mode, is specified, the values are CC f. If th e-G command-line switchis
omitted, the values are c u.
CC f
The CC means to not canonify hostnames. The f means to require that all hostnames
be supplied fully canonified.
c u
The c means to canonify all hostnames. The u means that hostnames do not need to be
supplied in canonified form.
But note that with the mc configuration, the default for the submit.cf file is to define the
DaemonPortOptions Modify= with the character E, which means to disallow use of the ETRN
command.
If you wishto specify different flags, you can use this DirectSubmissionModifiers option,
which is declared like this:
O DirectSubmissionModifiers=chars ?†? configuration file (V8.
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