Hi,
I would like to report that I successfully installed iRedMail on a Raspberry Pi.
Patches to enable rPi support can be found here: https://bitbucket.org/nifgraup/iredmail and notes are kept in a wiki: https://bitbucket.org/nifgraup/iredmail/wiki/Home
The first issue is that ClamAV takes a lot of memory, would it be possible to make it an optional component during installation time?