Over in the IETF we're slowly working on updating RFC 5321.

Today's topic is the HELP command. The current spec says that it is
mandatory to implment it. Most MTAs implement it by returning a fixed
string, or something close to fixed, e.g., gmail's answer appears to
include a code that tells you which instance you're talking to.

Unlike every other MTA I've looked at, Postfix doesn't implement it at
alll and returns an error code. You don't have to tell me that it's
not useful, but why not? It's in the spec, the work to return the
string is trivial.

R's,
John
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