Note: This feature requires Mailspring 1.0.12 (~December 29th, 2017) or newer.
Mailspring allows you to configure auto-CC and auto-BCC, so you can sync emails you send to another service, submit them for compliance review, or enable custom workflows.
Once you've linked your email account, you can turn on automatic CC / BCC by choosing "Preferences" from the menu, and then navigating to the Accounts tab. Select your work email account from the list of accounts and fill in the Automatic CC / BCC section that appears on the right:
To switch between CC and BCC, click the "BCC" dropdown. To add multiple email CC / BCC recipients, separate them with commas in the text field.
When you start composing a new email from this account, or reply to an email using this account, your message will be pre-populated with the address(es) you listed in the CC or BCC field. If you need to send a particular email without the automatically copied recipients, simply delete them from the CC / BCC fields in the message composer box.