Deleting messages in Mozilla Thunderbird takes only a moment.

The protocol of your account decides what happens on the server. With POP, the message is removed only from Mozilla Thunderbird and a copy stays on the mail server. With IMAP, the message disappears from both Mozilla Thunderbird and the mail server.

1. Start Mozilla Thunderbird.
Mozilla Thunderbird icon

2. Go to the Inbox, right-click the message to remove and choose Delete Message.
Delete Message option in Thunderbird

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