[Evolution] Using evo for read-only folders?

[Carsten Pedersen <carsten mysql com>]

Two Evo users on my setup, both of which access their mail in UNIX
mboxes. 

User A would like to share a certain mailbox with user B, and has made
that particular mbox world-readable. B can cat the mbox file, but of
course not write to it.

User B has configured Evo to use that mbox file, but when accessing the
mail folder the following error appears:

  Error while 'Opening folder spool:/users/a/admin/#admin':
  Could not open file: /users/a/admin//admin: Permission denied

I presume Evo is trying to open the file in read/write mode. Is there
some way of making it accept read-only permissions?

/ Carsten

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