File limits

Is there a way to check what limitations a suse 10 server has on files? I admin a server for about 85 mail users and have spamassassin configured to write all caught spam to a file and not deliver. The other day all the spams were being tagged and delivered. I looked at the file and it was pretty large so I moved it and gzipped it. Spams started being delivered to the empty file again. The file was (~2.1gigs) in size. I don't believe I have quotas of any sort enabled. I'm just wondering where to start looking into why this happened. Rob