It's actually not just the logrotate that got installed:
mailhost:/opt/zimbra/dspam/bin# rpm -qf /opt/zimbra/dspam/bin/dspam_logrotate
zimbra-mta-4.5.1_GA_660.RHEL4-20070201185254
mailhost:/opt/zimbra/dspam/bin# ls -alR /opt/zimbra/dspam
lrwxrwxrwx 1 root root 23 Feb 9 12:49 /opt/zimbra/dspam -> /opt/zimbra/dspam-3.6.2/
mailhost:/opt/zimbra/dspam/bin# ls -alR /opt/zimbra/dspam-3.6.2/
/opt/zimbra/dspam-3.6.2/:
total 28
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 40 root root 4096 Feb 9 12:52 ../
drwxr-xr-x 2 zimbra zimbra 4096 Feb 19 09:42 bin/
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 include/
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 lib/
drwxr-xr-x 4 zimbra zimbra 4096 Feb 9 12:49 man/
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 var/
/opt/zimbra/dspam-3.6.2/bin:
total 1160
drwxr-xr-x 2 zimbra zimbra 4096 Feb 19 09:42 ./
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ../
-rwxr-xr-x 1 zimbra zimbra 38288 Feb 1 18:56 cssclean*
-rwxr-xr-x 1 zimbra zimbra 38483 Feb 1 18:56 csscompress*
-rwxr-xr-x 1 zimbra zimbra 38258 Feb 1 18:56 cssconvert*
-rwxr-xr-x 1 zimbra zimbra 38415 Feb 1 18:56 cssstat*
-r-x--x--- 1 zimbra zimbra 350627 Oct 19 13:27 dspam*
-rwxr-xr-x 1 zimbra zimbra 78721 Feb 1 18:56 dspam_2sql*
-rwxr-xr-x 1 zimbra zimbra 78960 Feb 1 18:56 dspam_admin*
-rwxr-xr-x 1 zimbra zimbra 41673 Feb 1 18:56 dspamc*
-rwxr-xr-x 1 zimbra zimbra 82910 Feb 1 18:56 dspam_clean*
-rwxr-xr-x 1 zimbra zimbra 3522 Oct 19 13:27 dspam_corpus*
-rwxr-xr-x 1 zimbra zimbra 69453 Feb 1 18:56 dspam_crc*
-rwxr-xr-x 1 zimbra zimbra 78663 Feb 1 18:56 dspam_dump*
-rwxr-xr-x 1 zimbra zimbra 6483 Oct 19 13:27 dspam_genaliases*
-rwxr-xr-x 1 zimbra zimbra 3569 Oct 19 13:27 dspam_logrotate*
-rwxr-xr-x 1 zimbra zimbra 78657 Feb 1 18:56 dspam_merge*
-rwxr-xr-x 1 zimbra zimbra 82952 Feb 1 18:56 dspam_stats*
/opt/zimbra/dspam-3.6.2/include:
total 12
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ../
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 dspam/
/opt/zimbra/dspam-3.6.2/include/dspam:
total 76
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ../
-rw-r--r-- 1 zimbra zimbra 1072 Oct 19 13:27 buffer.h
-rw-r--r-- 1 zimbra zimbra 2264 Oct 19 13:27 config.h
-rw-r--r-- 1 zimbra zimbra 1438 Oct 19 13:27 config_shared.h
-rw-r--r-- 1 zimbra zimbra 4920 Oct 19 13:27 decode.h
-rw-r--r-- 1 zimbra zimbra 2215 Oct 19 13:27 diction.h
-rw-r--r-- 1 zimbra zimbra 1419 Oct 19 13:27 error.h
-rw-r--r-- 1 zimbra zimbra 1537 Oct 19 13:27 heap.h
-rw-r--r-- 1 zimbra zimbra 3307 Oct 19 13:27 libdspam.h
-rw-r--r-- 1 zimbra zimbra 13472 Oct 19 13:27 libdspam_objects.h
-rw-r--r-- 1 zimbra zimbra 2501 Oct 19 13:27 nodetree.h
-rw-r--r-- 1 zimbra zimbra 6647 Oct 19 13:27 storage_driver.h
-rw-r--r-- 1 zimbra zimbra 2132 Oct 19 13:27 tokenizer.h
/opt/zimbra/dspam-3.6.2/lib:
total 480
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ../
-rw-r--r-- 1 zimbra zimbra 87932 Feb 1 18:57 libdspam.a
-rwxr-xr-x 1 zimbra zimbra 820 Oct 19 13:27 libdspam.la*
lrwxrwxrwx 1 zimbra zimbra 17 Feb 9 12:49 libdspam.so -> libdspam.so.7.0.0*
lrwxrwxrwx 1 zimbra zimbra 17 Feb 9 12:49 libdspam.so.7 -> libdspam.so.7.0.0*
-rwxr-xr-x 1 zimbra zimbra 193602 Oct 19 13:27 libdspam.so.7.0.0*
-rw-r--r-- 1 zimbra zimbra 14842 Feb 1 18:57 libhash_drv.a
-rwxr-xr-x 1 zimbra zimbra 841 Oct 19 13:27 libhash_drv.la*
lrwxrwxrwx 1 zimbra zimbra 20 Feb 9 12:49 libhash_drv.so -> libhash_drv.so.7.0.0*
lrwxrwxrwx 1 zimbra zimbra 20 Feb 9 12:49 libhash_drv.so.7 -> libhash_drv.so.7.0.0*
-rwxr-xr-x 1 zimbra zimbra 43249 Oct 19 13:27 libhash_drv.so.7.0.0*
-rw-r--r-- 1 zimbra zimbra 30432 Feb 1 18:57 libmysql_drv.a
-rwxr-xr-x 1 zimbra zimbra 890 Oct 19 13:27 libmysql_drv.la*
lrwxrwxrwx 1 zimbra zimbra 21 Feb 9 12:49 libmysql_drv.so -> libmysql_drv.so.7.0.0*
lrwxrwxrwx 1 zimbra zimbra 21 Feb 9 12:49 libmysql_drv.so.7 -> libmysql_drv.so.7.0.0*
-rwxr-xr-x 1 zimbra zimbra 73519 Oct 19 13:27 libmysql_drv.so.7.0.0*
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 pkgconfig/
/opt/zimbra/dspam-3.6.2/lib/pkgconfig:
total 12
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ../
-rw-r--r-- 1 zimbra zimbra 229 Oct 19 13:27 dspam.pc
/opt/zimbra/dspam-3.6.2/man:
total 16
drwxr-xr-x 4 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ../
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 man1/
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 man3/
/opt/zimbra/dspam-3.6.2/man/man1:
total 44
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 4 zimbra zimbra 4096 Feb 9 12:49 ../
-rw-r--r-- 1 zimbra zimbra 12437 Oct 19 13:27 dspam.1
-rw-r--r-- 1 zimbra zimbra 2320 Oct 19 13:27 dspam_clean.1
-rw-r--r-- 1 zimbra zimbra 1429 Oct 19 13:27 dspam_corpus.1
-rw-r--r-- 1 zimbra zimbra 1518 Oct 19 13:27 dspam_dump.1
-rw-r--r-- 1 zimbra zimbra 1832 Oct 19 13:27 dspam_merge.1
-rw-r--r-- 1 zimbra zimbra 1615 Oct 19 13:27 dspam_stats.1
/opt/zimbra/dspam-3.6.2/man/man3:
total 16
drwxr-xr-x 2 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 4 zimbra zimbra 4096 Feb 9 12:49 ../
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_addattribute.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspa .3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_attach.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_create.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_destroy.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_detach.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_getsource.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_init.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
lrwxrwxrwx 1 zimbra zimbra 43 Feb 9 12:49 dspam_process.3 -> /opt/zimbra/dspam-3.6.2/man/man3/libdspam.3
-rw-r--r-- 1 zimbra zimbra 6671 Oct 19 13:27 libdspam.3
/opt/zimbra/dspam-3.6.2/var:
total 12
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ./
drwxr-xr-x 7 zimbra zimbra 4096 Feb 9 12:49 ../
drwxr-x--- 2 zimbra zimbra 4096 Oct 19 13:27 dspam/
/opt/zimbra/dspam-3.6.2/var/dspam:
total 8
drwxr-x--- 2 zimbra zimbra 4096 Oct 19 13:27 ./
drwxr-xr-x 3 zimbra zimbra 4096 Feb 9 12:49 ../
mailhost:/opt/zimbra/dspam/bin#  |