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I can't change the default email address in my Thunderbird address book

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I use four email addresses with Thunderbird. Up to now, whenever I want to send an email to a group in my Thunderbird address book, it automatically uses my main email address. Suddenly, it's started using as a default one of the other email address. How can I change the default email address so that it uses my main one again?

I use four email addresses with Thunderbird. Up to now, whenever I want to send an email to a group in my Thunderbird address book, it automatically uses my main email address. Suddenly, it's started using as a default one of the other email address. How can I change the default email address so that it uses my main one again?

Chosen solution

tools > Account settings. click the account down below, use "account actions" to set default

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Chosen Solution

tools > Account settings. click the account down below, use "account actions" to set default

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That's brilliant. Thanks so much, Wayne