smtpsrv: Improve "Received" header standard compliance
Despite its loose appearance, the "Received" header has a reasonably standarized format. We were not following the standard format as closely as we should; this rarely causes problems in this particular case, but there's no need to deviate from it. This patch changes the Received header generation as follows: - The "from" section now uses the remote address as canonical (for non-authenticated users) which provides more valuable information than the user-supplied EHLO address (which is also included). - The remote authenticated user is now hidden, for additional privacy. - Use the "with" optional clause. - Use the standard way of printing TLS cipher suite. - Use the standard way of printing address literals.
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