Someone

        <Anonymous /path/to/ftp>
          User                          ftp
          Group                         nogroup
          UserAlias                     anonymous ftp
          UserAlias                     guest ftp
          MaxClients                    10
          <Directory *>
            <Limit WRITE>
              DenyAll
            </Limit>
          </Directory>
          <Directory /path/to/ftp/incoming>
            Umask                       002
            <Limit STOR>
              AllowAll
            </Limit>
            <Limit READ>
              DenyAll
            </Limit>
          </Directory>
        </Anonymous>