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Sendmail, 3rd Edition by Bryan Costales

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Section 18.2.1

Rules (the R lines) can no longer exist outside of rule sets (the S line) without producing an error (V8.10 and later).

Section 18.2.1

If the configuration file lacks a correct version number (the V line), sendmail will complain (V8.9 and later).

Section 18.2.2

Prior to V8.10, RFC2822-style comments were removed from all rules.

Section 18.3

An error will print if the OperatorChars option is declared after any rule (V8.10 and later).

Section 18.6

The $# operator can now appear in the LHS of a rule (V8.9 and later).

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