NI: Not authorized to send mail to this user or group (4316819)

Issue

When you try to send a message, the following error appears in the Lotus Notes log and on the console, and you receive a non-delivery report:

"Not authorized to send mail to this user or group." 

Cause

This situation is caused by a Person Document security setting when only Anonymous access is selected. 

Solution

Change security setting on document:

Error: 'Not authorized to send mail to this user or group' when sending mail

1. Open a Person Document on a Domino server. 
2. Access the Document Properties InfoBox of the person record -- Security panel (key icon).
3. Deselect "All readers and above," select "Anonymous," and close the InfoBox.
4. Send another SMTP message to the user. The error appears on the console and you receive a non-delivery report. 

Workaround

In order to have mail delivered without "All readers and above," select LocalDomainServers on the Security panel in the Document Properties InfoBox.

NOTES.INI workaround 

How Have Hidden Groups and Mail Addressing Changed in Domino 6.x? 

Workaround

Starting in Domino 6.5.1, it is possible to alter this behavior slightly by adding the following parameter to the Notes.ini: 

"RouterDisableReadersField=1"

 After this has been added, the user will still not be able to send to the group by only entering in the group name, and they should still receive the same errors as previously stated above. However, if the user addresses to <group>@<domain>, the mail will deliver.  

Note: Neither of the above scenarios allow for group lookup during addressing, as the group is "hidden" to the user. Additionally, the only way that the group will ever be sent to without having to add the notes.ini parameter and append "@<domain>", is if the name is ambiguous. If the ambiguous name lookup is triggered, it appears to do a full exhaustive lookup on the name, regardless whether the user can actually select the group to address to.