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add HELOHost option for SMTP greeting (#26)

net/smtp hardcodes the greeting to "localhost" and nothing outside the process can change it, so servers with helo restrictions reject the connection. Unset, `Hello` is never called and the greeting stays "localhost", so existing callers are unchanged on the wire. Also closes the connection when `Hello` or `StartTLS` fails, the `StartTLS` path leaked it before.

Related to #25

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