When more than one character is returned, each must be separated
from the next by a space. Each character turns a feature on or off. If the character is lowercase,
it turns the feature on. Uppercase turns the feature off. One character, the t, is special
because it causes sendmail to temporarily fail the connection.
If anything other than the characters shown in the table is returned, that bad character is
silently ignored.
The default setting for any of these characters depends on the use of the character. For
example, if noetrn is specified for the PrivacyOptions option (?§24.9.86.4 on page 1066), the
default is the character E; otherwise, the default is the character e. Whereas if Modify=A is
specified for the DaemonPortOptions option (?§24.9.27.7 on page 996), which sets the
daemon??™s listening port, the default is A; otherwise, it is a. In general, B, D, E, and X take
their defaults from the various PrivacyOptions option settings, whereas L and R take their
defaults from the various Modify= settings. But note that P defaults to p if sendmail was
compiled with the PIPELINING build-time macro defined; otherwise, it defaults to P,
which cannot be overridden.
The srv_feature rule set is passed the connecting client??™s hostname in its workspace.
Instead, you must base your policy decisions on the various sendmail macro values available.
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