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  • mail.imap.auto_unsubscribe_from_noselect_folders  Default and desired value: true
  • mail.server.default.check_all_folders_for_new  Default false.  Setting it true avoids the user having to wait for mails to be downloaded on opening folders other than the Inbox – but it may degrade overall performance, especially when Thunderbird is started.  When the IMAP server is local it should be OK.  In case of several IMAP servers, the setting can be made for specific servers using mail.server.server<n>.check_all_folders_for_new

Too many simultaneous connections

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Subscribing

Depending on the setting of TBC, folders on the server that the client has not subscribed to are invisible or shown greyed out.

To subscribe to folders, right click any folder and choose Subscribe.  Expand the list until the folders you want to subscribe are visible, toggle (\?) the checkbox and click Subscribe.

After IMAP changes (including a cyrus reconstruct that fixed something), right click the account and choose "Subscribe ...".

Usage

Archive folder removal

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From kb.mozillazine (http://kb.mozillazine.org/Compacting_folders): If the folder is severely corrupted, deleting the .msf file won't help much, and compacting the folder may just make things worse because Thunderbird can't reliably figure out where a message ends anymore. You'll typically run into this only with the Inbox folder. It's much more vulnerable to corruption because it frequently has both lots of messages and a high percentage of deleted (but not visible) messages. That's why it's recommended that you move messages you want to keep to other folders/child folders rather than keep storing them in the Inbox."

Troubleshooting

Greyed out folders

Folders are shown in grey italics when they have the \NoSelect flag.  Normally this means they can contain subfolders, but not messages.  A good example is the "[Gmail]" folder on Gmail accounts.

Logging

Sample script to be run in the desktop environment (TODO: $LOGNAME does not have a value ...?  The ; after imap:5 is spurious ... ?):

#!/bin/bash
export NSPR_LOG_MODULES=imap:5;
export NSPR_LOG_FILE=/tmp/$LOGNAME.imap.log
/usr/lib/thunderbird/thunderbird &

Subscribing

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Missing folders

May not be subscribed.

Too many simultaneous connections

In case of trouble with "too many simultaneous connections" (common with bluelight@auroville.org.in), reduce the "Maximum number of server connections to cache" (TODO: presumably on all clients); the default value is 5.  Account settings > Server Settings > Advanced.

 

References

Thunderbird as a Gmail client: http://kb.mozillazine.org/Gmail