fileSystem = new MockFileSystem();
chain.put("fileSystem", fileSystem);
chain.put("org.apache.james.smtpserver.protocol.DNSService", dnsService);
chain.put("recipientrewritetable", new RecipientRewriteTable() {
@Override
public void addRegexMapping(String user, String domain, String regex) throws RecipientRewriteTableException {
throw new UnsupportedOperationException("Not implemented");
}