"Could not load a valid user"?

Hi

Currently I am dealing with an issue in RTIR where it will consistenly
return the following error message upon all email based replies from
someone not created in RTIR:

RT could not load a valid user, and RT’s configuration does not allow
for the creation of a new user for this email (blah@blah.monash.edu.au).

You might need to grant ‘Everyone’ the right ‘CreateTicket’ for the
queue Incident Reports.
I have complied with the instructions as stipulated above and still
receive the same error.

Has anyone else encountered this? And if so, how did you fix this?

Thanks in advance,

Jarrod Loidl
IT Security of Infrastructure Services,
Information Technology Services, Monash University - Clayton
Phone: +61 3 99052055 Fax: +61 3 99054746