As it says, easy to install
I'm a very happy user of dkimap. Having just installed dkimap this afternoon, I can say that it lives up to its boast of being "Easy to install." A couple notes that may help others:
dkimap expects mail to be stored in /var/mail/username. If you store it in /var/spool/mail/username instead (this is the default for RH, I believe), a symlink makes dkimap happy.
the configure program doesn't automatically #define PW_SHADOW for shadow password authentication. Adding this to unixlib/passwd.h will fix this.
As of version 2.22, dkimap will spam your syslog with LOG_NOTICE messages, filed under LOG_DAEMON. You may want to change these in unixlib/libf.C to LOG_DEBUG and LOG_MAIL, respectively.