Changes with nginx 0.5.33 07 Nov 2007

    *) Change: now by default the "echo" SSI command uses entity encoding.

    *) Feature: the "encoding" parameter in the "echo" SSI command.

    *) Change: mail proxy was split on three modules: pop3, imap and smtp.

    *) Feature: the --without-mail_pop3_module, --without-mail_imap_module,
       and --without-mail_smtp_module configuration parameters.

    *) Feature: the "smtp_greeting_delay" and "smtp_client_buffer"
       directives of the ngx_mail_smtp_module.

    *) Feature: the "server_name" and "valid_referers" directives support
       regular expressions.

    *) Feature: the "server_name", "map", and "valid_referers" directives
       support the "www.example.*" wildcards.

    *) Bugfix: sub_filter did not work with empty substitution.

    *) Bugfix: in sub_filter parsing.

    *) Bugfix: a worker process may got caught in an endless loop, if the
       memcached was used.

    *) Bugfix: nginx supported low case only "close" and "keep-alive"
       values in the "Connection" request header line; bug appeared in
       0.5.32.

    *) Bugfix: nginx could not start on Solaris if the shared PCRE library
       located in non-standard place was used.