just tried it on another mailbox, same issue i believe
[zimbra@mail reza]$ zmtrainsa mail.rndcomputing.com
dotty@thefeld.com **** spam Junk
10122 messages for
dotty@thefeld.com at mail.rndcomputing.com (folder Junk).
reading message dotty@thefeld.com@mail.rndcomputing.com:1 of 10122 (1654 header octets) . (667 body octets) .config: could not find site rules directory
archive-iterator: raw location "-" is not supported at /opt/zimbra/zimbramon/lib/Mail/SpamAssassin/ArchiveIterator.pm line 734.
Learned from 0 message(s) (0 message(s) examined).
not flushed
reading message dotty@thefeld.com@mail.rndcomputing.com:2 of 10122 (1837 header octets) . (566 body octets) .config: could not find site rules directory
archive-iterator: raw location "-" is not supported at /opt/zimbra/zimbramon/lib/Mail/SpamAssassin/ArchiveIterator.pm line 734.
Learned from 0 message(s) (0 message(s) examined).
not flushed
reading message dotty@thefeld.com@mail.rndcomputing.com:3 of 10122 (1583 header octets) . (2508 body octets) ..config: could not find site rules directory
archive-iterator: raw location "-" is not supported at /opt/zimbra/zimbramon/lib/Mail/SpamAssassin/ArchiveIterator.pm line 734.
Learned from 0 message(s) (0 message(s) examined).
fetchmail: SIGPIPE thrown from an MDA or a stream socket error
fetchmail: socket error while fetching from mail.rndcomputing.com
fetchmail: Query status=2 (SOCKET)
config: could not find site rules directory
bayes: synced databases from journal in 1 seconds: 375 unique entries (422 total entries)
Training DSPAM
[zimbra@mail reza]$