It is quite surprising that the opensolaris distribution does not come with an imap server in the standard repositories. I needed one and the simplest one to use is the one from UW IMAP.
I downloaded the source package from:
ftp://ftp.cac.washington.edu/imap/imap.tar.gz
The UW IMAP documentation is at http://www.washington.edu/imap/documentation/
I have GCC installed in my opensolaris 2009.6
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