A problem that started some years ago that never seems to get fixed: - I have an e-mail 'account' in Thunderbird, with two 'identities'. - In 'Copies & Folders', the account specifies an e-mail address to 'Bcc these email these addresses" (and the option is ticked). - The second identity also specifies BCC e-mail addresses (ticked): in this case two e-mail addresses separated by a semi-colon and a space. - When sending or replying to an e-mail, if I change the "from" address, one of these e-mail addresses disappears from BCC. (In fact it's the one which is common between both identities). - If I do not change the "from" address, BCCs for either identity appear correctly.