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Steps to Rebuild the Global Database
Quit Thunderbird.
Locate the global-messages-db.sqlite file in your Thunderbird Profile .
Delete the global-messages-db.sqlite file.
Start Thunderbird. The re-indexing process will start automatically. Depending on the number of messages, it might take some time for the indexing to complete. You can continue to use Thunderbird, but performance might be affected and search will return only partial results or even no results until the indexing is complete. The indexing progress can be monitored through the Tools | Activity Manager menu.
E-mail corrupted by Yahoo, Verizon, BellSouth, etc. servers. Was: Use `CTE: 8bit` only when the server is advertising the 8BITMIME support
What character encoding settings do I need so that Thunderbird with Yahoo! stops replacing special characters (such as German umlauts) with "??"
Strange characters show in sent emails.Recipients complain, I see this in their responses. This is since Thunderbird 60.3 on W10
!) Set pref mail.strictly_mime to true Tools > Options, Advanced, General tab, Config Editor, paste "mail.strictly_mime".
