Add-ons
About this Add-on
Shows the missing envelopes in message list
To create your own collections, you must have a Mozilla Add-ons account.
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![[Warning]](https://addons.thunderbird.net/static/img/developers/test-warning.png?b=58a99cbb-667a0970)
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Some add-ons ask for permission to perform certain functions. Since you’re in control of your Thunderbird, the choice to grant or deny these requests is yours.
Please note this add-on uses legacy technology, which gives it access to all browser functions and data without requesting your permission.
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