Mails send by the notify feature (function notify in common.php) have non-valid urls for the old and new page versions; something like
http://somewiki.country/?id=somepage
instead of
http://somewiki.country/doku.php?id=somepage
maybe the upper works with some apache configurations, but not in general
common.php:
750c750
< $text = str_replace('@NEWPAGE@',wl($id,'','',true),$text);
---
> $text = str_replace('@NEWPAGE@',wl($id,'','doku.php',true),$text);
756c756
< $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",'',true),$text);
---
> $text = str_replace('@OLDPAGE@',wl($id,"rev=$rev",'doku.php',true),$text);
could solve the problem.