Safe senders list ignored in Outlook 2003 using RPC-HTTP connectio

[AndersB]

I have a couple of clients running Outlook 2003 (Office SP3 installed) on XP
clients using RPC-HTTP in cached exchange-mode to connect to a Exchange 2003
SP2 server.

The problem is that mails from some senders are routed to the recievers junk
email folder. I have set the junk email option in their Outlook client to
lowest setting, meaning only the blocked senders list should be used. Then
the senders address has been placed in the safe senders list (verified that
it's not in the blocked list)
When a mail from this sender comes it is sent to the junk email folder. If I
mark the mail and choose 'add to safe senders list' it works until Outlook is
restarted, then the incoming mails from this sender is routed to the junk
email folder again, although the senders address is listed in the safe
senders list.

If the user connect using OWA it works, the incoming mail is routed to the
inbox as it should but when they use the Outlook client it's fails.

What might be the problem here?

 

[AndersB]

Deleted the junk e-mail rule from Outlooks IMAPI folder to make Outlook
recreate it in case it was corrupted but unfortenately this did not help.
I am at my wits end with this - does anyone have any idea what might be the
cause of this problem?

 

[AndersB]

I've now tried to start the Outlook client with the /cleanrules option as
well as creating a new profile but mail from this sender is still routed to
junk email folder although the sender is listed as safe sender.

There are two different people using the same exchange server experiencing
this very same problem (same sender in both cases) but other people on the
same server have no problems with this sender.

 

[AndersB]

Problem solved! It was a third-party anti-spam software installed on these
clients that even those users didn't know about that was messing things up.
Once this softwre was disabled everything was working again.