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There is only authentication code in the client, but not in the server. The list of commands processed by our server does not include "AUTH"
The help document says, "to a real SMTP server" for the user and passwd arguments, but not the auth_type. So should also say "for a real smtp server" for AUTH_TYPE as well, since user and passwd don't work without auth_type anyway.
Syntax
The basic ESMTP syntax is:
esmtp://IP_Address USER=myname PASSWD=mypasswd AUTH_TYPE=auth_type FROM=<user@host> TO=<user@host> SUBJECT=<"my_subject"> DATA=<content of message>
See the Parameters section for the SMTP parameter definitions. The following are additional (optional) parameters for ESMTP: