Postfix Plesk on Ubuntu Error fatal: open database /var/lib/postfix/smtpd_scache.db: Invalid argument

Woke up this morning and the Postfix SMTP server on Ubuntu 10.04 and Plesk stopped running. I could start and stop via service # service postfix start and it appeared everything was working fine. However, it wasn't until I looked at the syslog /var/log/syslog that I saw an error occurring on start up. Nov 26 12:51:27 blue postfix/tlsmgr[28017]: fatal: open database /var/lib/postfix/smtpd_scache.db: Invalid argument Nov 26 12:51:29 blue postfix/master[28012]: warning: process /usr/lib/postfix/tlsmgr pid 28017 exit status 1 Nov 26 12:51:29 blue postfix/master[28012]: warning: /usr/lib/postfix/tlsmgr: bad command startup -- throttling SOLUTION: 1. stopped postfix: # service postfix stop 2. deleted the cache files friom /var/lib/postfix # rm /var/lib/postfix/smtpd_scache.db and # rm /var/lib/postfix/smtp_scache.db 3. restarted postfix and voila, everything works: # service postfix start hope this helps!