doc: add note that smtp_forward only supports STARTTLS (#1988)
doc: add note that smtp_forward only supports STARTTLS (#1988)


msimerson/Haraka,msimerson/Haraka,smfreegard/Haraka,smfreegard/Haraka,haraka/Haraka,msimerson/Haraka,haraka/Haraka,smfreegard/Haraka,smfreegard/Haraka,msimerson/Haraka,haraka/Haraka,haraka/Haraka