postfix compiles on OpenSolaris
postfix runs
postfix tries to accept email
postfix uses statvfs to enquire free space on /var/spool
/var/spool is on ZFS with > 2TB free space
statvfs dies (EOVERFLOW)
postfix dies
poor email
UPDATE: small patch fixes this, assuming
that an FS with more than ULONG_MAX/2 free blocks has
— for all purposes of postfix — exactly ULONG_MAX/2 free
blocks.