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Automatic recipient fill-in messes up

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When I type in a recipient's name, Thunderbird automatically guesses at the email, but sometimes produces addresses no longer valid (even though I've deleted them from my address book.) I end up sending messages that bounce. How can I delete those invalid addresses?

When I type in a recipient's name, Thunderbird automatically guesses at the email, but sometimes produces addresses no longer valid (even though I've deleted them from my address book.) I end up sending messages that bounce. How can I delete those invalid addresses?

Chosen solution

How about checking the answer to your first question before asking the same one again?

https://support.mozilla.org/en-US/questions/1004999?esab=a&s=&r=1&as=s

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Chosen Solution

How about checking the answer to your first question before asking the same one again?

https://support.mozilla.org/en-US/questions/1004999?esab=a&s=&r=1&as=s