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h Mail Server does not include support for the TURN verb.If a SMTP client tries to use a command which h Mail Server has no implementation for, this error message is sent to the client.

By default, h Mail Server does not require SMTP authentication for connections coming from localhost / 127.0.0.1.

If a client fails to tell h Mail Server the senders or recipients address prior to trying to submit the message content, h Mail Server will respond with this error. When a SMTP client is delivering an email to a SMTP server, it must specify both the sender and recipient before trying to submit the actual message content.

The client must first tell the server the sender address and after that the recipient address.

For information on how to enable SMTP authentication, check the HOWTO.

If you are using a Cisco router, you may need to disable SMTP Fixup protocol.

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