Pre-V8.7 Configuration File Declarations
The old form for an option command in the sendmail.cf file is:
OXargument ← prior to V8.7
Like all configuration commands, the uppercase letter
O must begin
the line. It is immediately followed (with no
intervening space) by another single letter, which
selects a specific option. Uppercase letters are
distinct from lowercase for single-character option
names (that is, X
is different from x). Depending on the option selected,
an argument might be
required. There must be no intervening space between
the single-character option name and its
argument.
Single-character option names should be considered deprecated in favor of the more modern multicharacter option names.
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