Amavis-virusmails

Hi, Amavis is collecting quite a number if emails in /var/spool/amavis/virusmails. (Running postfix on Suse 10.0 retail). These are all .gz format, most contain .gif file attachments. There are about 20MB of emails in this directory to date, almost 1,000 files. All .gz file names start with "spam-.gz" except for 3 that start with "banned" and one with "virus". Can I just delete these files, without any other consequence? If this is important, I'm also running spamd, separately. Many thanks Jim