I am running Exchange 5.5 behiind a firewall. Recently installed a spam filtering server, and since then I have had several complaints that users who had set up Outlook (Outlook Express) on their home computers were no longer able to connect. Get an error on port 143--ssl. Should they have been able to set up Outlook in a different domain using our Exchange server? Does this uncover a security issue that previously existed? Any help would be appreciated. Thanks.