postfix+amavis-new

Hello. Because Sobig.F is still expanded, I have installed amavis-new with virus scanner on mail server. It works, worms and viruses are trashed. But I saw that if to mail server comes clear message without any worm or virus, but username is wrong, server don't send back mail. Server keeps it in queue. How can I fix it? -- ++++++++++++++++++++++++++++++++++++++++++ Dominik Składanowski ++++++++++++++++++++++++++++++++++++++++++