Blank lines and lines that begin
# character are considered comments and are ignored.
A blank line is one that contains no characters at all (except for
its terminating newline). Indentation characters (spaces and
tabs) are invisible and can turn
an apparently blank line into an empty-looking line, which is
# text a comment tabtext a continuation line a blank line tab an "empty-looking line"
Except for V8 sendmail and two special cases, comments
occupy the entire line. The two special cases are the
S configuration commands.
R command is composed
of three tab-separated fields, the third field being a comment that
does not require a leading
Rlhs rhs comment
S command looks only for a number following it and
ignores everything else, so it may also be followed by a comment:
S3 this is a comment
No other commands allow comments to follow on the same line:
CWlocalhost mailhost # This won't work prior to V8