dovecot-postfix imap configuration for thunderbird

[Thufir Hawat]

to configure dovecot and thunderbird, the suggestion is:


Thunderbird

To use with Thunderbird, edit the file /etc/dovecot/dovecot.conf:

protocol imap {
 ...
login_greeting_capability = yes
imap_client_workarounds = tb-extra-mailbox-sep
}


but when I look at:


/etc/dovecot/conf.d/20-imap.conf this seems to be where the imap function 
is, not in dovecot.conf.  The function includes the following comment:
  # Workarounds for various client bugs:
  #   delay-newmail:
  #     Send EXISTS/RECENT new mail notifications only when replying to 
NOOP
  #     and CHECK commands. Some clients ignore them otherwise, for 
example OSX
  #     Mail (<v2.1). Outlook Express breaks more badly though, without 
this it
  #     may show user "Message no longer in server" errors. Note that OE6 
still
  #     breaks even with this workaround if synchronization is set to
  #     "Headers Only".
  #   tb-extra-mailbox-sep:
  #     Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) 
and
  #     adds extra '/' suffixes to mailbox names. This option causes 
Dovecot to
  #     ignore the extra '/' instead of treating it as invalid mailbox 
name.
  #   tb-lsub-flags:
  #     Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
  #     This makes Thunderbird realize they aren't selectable and show 
them
  #     greyed out, instead of only later giving "not selectable" popup 
error.
  #
  # The list is space-separated.
  #imap_client_workarounds = 



so that last line is where the workaround should go?


I'm using this mailstack:  
http://packages.ubuntu.com/quantal/dovecot-postfix


I see that ubuntu docs on dovecot also say:

imap_client_workarounds = tb-extra-mailbox-sep
https://help.ubuntu.com/community/Dovecot



but just want to make sure that I'm doing it correctly, as there's no imap 
function in the specified file.

thanks,

Thufir