Internet Direct (Indy) Version 9.0.2 Beta
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property OnCommandTURN: TBasicHandler;
The SMTP TURN command, described in RFC 821, raises important security issues since, in the absence of strong authentication of the host requesting that the client and server switch roles, it can easily be used to divert mail from its correct destination. Its use is deprecated in RFC 2821. SMTP systems should not use it unless the server can authenticate the client.