Hi,
I also had this issue with Thunderbird on my old ZCS5 server when I moved my default domain over to my new ZCS6 server.
Other hosted accounts would get the "LSUB failed" error but continued working.
The solution was to set a new default domain in Zimbra:
> zmprov mcf zimbraDefaultDomainName default.com
solved the problem without requiring a restart.
(Note that zimbraDefaultDomainName was empty because the default domain was deleted).
I know this thread is old, but it's the first hit when googling LSUB failed.
Hope I can help someone with this.
Best regards,
MM |