Email, Messaging, & Video Calls Email How to Send a Bcc: Copy in Mozilla Thunderbird By Heinz Tschabitscher Writer A former freelance contributor who has reviewed hundreds of email programs and services since 1997. our editorial process Heinz Tschabitscher Updated December 13, 2019 Email Yahoo! Mail Gmail Tweet Share Email Having a copy of all outgoing mail in the Sent folder may be well and good, but what if you want to collect your mail in another account, for example, or have to archive all outgoing messages separately? In Mozilla Thunderbird, you can easily send Bcc: copies of all mail to any and every email address you like. Invisible to other recipients, these copies can create a trail of the mail you send, or just act as a secondary Sent folder. Send an Automatic Bcc: Copy of Outgoing Mail in Mozilla Thunderbird To automatically send a Bcc: copy of all mail to one or more email addresses in Mozilla Thunderbird: Select Tools | Account Settings... from the menu in Mozilla Thunderbird.Go to Copies & Folders under the desired account.Make sure Bcc these email addresses: is checked.Type the desired address or addresses.Separate multiple addresses with a comma. Click OK. When you compose a new message in Mozilla Thunderbird, the automatic Bcc: addresses have already been entered. If desired, you can selectively remove them, of course.