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How to add all recipients in an address sublist to BCC

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I have various sub address books. For example "warnings". I used to be able to right click on one of these and choose "add to BCC". All of the addresses would then be added to BCC in my email to send. Then I could type the message and send it to all without sharing individual email addresses. I can no longer do this. I am using an older version of thunderbird 91.13.1. When I updated it a few years ago, I couldn't find my way around, so I stuck with the old version because it was working for me! Many thanks for suggestions or solutions.

I have various sub address books. For example "warnings". I used to be able to right click on one of these and choose "add to BCC". All of the addresses would then be added to BCC in my email to send. Then I could type the message and send it to all without sharing individual email addresses. I can no longer do this. I am using an older version of thunderbird 91.13.1. When I updated it a few years ago, I couldn't find my way around, so I stuck with the old version because it was working for me! Many thanks for suggestions or solutions.
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If you save the email you receive when you post, that will take you back to the thread. Another way is to login in to forum and click your name.

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I brought up ver 91, clicked to write message, clicked F9 to show contact list, highlighted a mailing list, clicked 'add to BCC' and it worked. If this used to work, maybe the addressbook is corrupted? I don't have any suggestions, but maybe others do.

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Many thanks. I'm still unable to do that. I will try again. I posted this question again because I am unable to access the "my questions" in my profile. Actually I don't know how to get into my profile. Jack

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Chosen Solution

If you save the email you receive when you post, that will take you back to the thread. Another way is to login in to forum and click your name.

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Continuation of support question: (I upgraded to 128.2.2esr) I'm afraid to upgrade to any new versions because the corrupted autoupdate prohibited me from loading Thunderbird ... (Just a comment)

My original issue: I'm not able to copy a sub-address book list to the BCC line to forward an email or send a new email to a specific list, such as 'Warnings" or "comedy" Right click on an item in the list does not work. There used to be a "copy to BCC" choice when right clicking on an address book list. Any suggestions greatly appreciated. Sorry to sound like a stuck record. John

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