Finally I manage to update my local exim server to exim4. I was a bit afraid of doing it since the configuration files of exim4 are quite different from the older versions, but there is a neat little script called [code]exim_convert4r4[/code] which converts the old config files into the new format. You can call the script with

[code]exim_convert4r4 < /etc/exim/exim_old.conf > /etc/exim4/exim4.conf[/code]

and voilà, welcome to exim's next generation.