I had a similar problem with people sending out email to external
clients - the client would obtain the email but the attachment would
say it is read-only.

I ended up looking in the local mailbox in their sent items and trying
to open the attachment. The open failed. So I wanted to check
permissions, the users were in the local administrators group but it
showed their security identifier (SID). This lead me to believe there
was an authentication problem. I checked their local server and found
that the WINS service was corrupt. I fixed WINS and the problem went
away. This could be similar if you are running a W2K or W2K3 ADS
environment where DNS is heavily relied upon - you may just be using a
cache logon so you may not pick it straight away.


--
Struth
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