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Typically, when Anonymous SMTP Access is turned off in the server document, Authentication is required. This is configured in the server document via Ports -> Internet Ports -> Mail -> SMTP InBound (Authentication Options: Name & Password = Yes AND Anonymous = No). With R5.0.6, a new feature is added, allowing for an exception list of hosts and/or IP addresses that are not required to Authenticate when SMTP authentication is required (Anonymous SMTP Access is turned off ). This is enabled via a new NOTES.INI parameter, SMTPAllowConnectionsAnonymous=1.
This Exceptions List is maintained in the Server Configuration document (Router/SMTP -> Restrict. & Controls -> SMTP InBound Controls), in the field "Allow connections only from the following SMTP internet hosts/IP addresses".
Because of Microsoft WINS/DNS issues on NT 4.0, it is recommended that you use IP Addresses in the form [nnn.nnn.nnn.nnn], instead of host names.