Thunderbird does not always send the reply message
It has happened several times now that a message that I replied turned out not to have been received by the person I replied it to. This although Thunderbird indicates that it has been sent.
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That's quite possible, for whatever reason. Once the message has been sent from your Thunderbird it's beyond your control what happens, and certainly not a Thunderbird problem. It may be an issue at your email provider's server, at the recipients email provider server, or at the recipients computer/email client. The first thing I'd do is to ask the recipient to check the spam folder.