I just completed an upgrade from 6.0.1 to 6.0.2 (OS Edition, Ubuntu 8.04).
All seemed to go well, however, after upgrade all mail is sitting permanently in the queue as deferred.
Looking at the logs, it is showing the issue as an amavis-dspam one -
Oct 25 10:44:29 s11 postfix/smtp: A9F3644E03D: to=<mail@***.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=5.7, delays=0.01/0/0/5.7, dsn=4.5.0, status=deferred (host 127.0.0.1[127.0.0.1] said: 451 4.5.0 Error in processing, id=04925-02, spam_scan FAILED: DSPAM failed: DSPAM: error running program /opt/zimbra/dspam/bin/dspam: exit 6 at (eval 87) line 109, <GEN30> line 163. (in reply to end of DATA command))
Anyone seeing anything similar - I tried to disable dspam checking, that did not seem to help.