The To, CC, and BCC fields in an email are not just routing instructions. They are a social signal. Who you include, and in which field, communicates something about the nature of the message, the relationships involved, and occasionally, the level of escalation in progress.
The To field
The To field is for people who need to act on or respond to the email. If someone is in the To field, they are expected to do something. If they do not need to do anything, they should not be in the To field.
The CC field
CC stands for carbon copy. It is for people who need to be informed but are not expected to act. In practice, it has evolved into a multi-purpose tool:
- The informational CC: Keeping someone in the loop. Legitimate and common.
- The accountability CC: Adding someone's manager to an email to signal that the situation has been escalated. The recipient notices. The manager notices. Everyone understands what has happened.
- The witness CC: Adding a third party to document that a communication occurred. "I am CC'ing our project coordinator so there is a record of this conversation." This is the email equivalent of asking someone to sign a receipt.
- The protective CC: Adding your own manager to an email to demonstrate that you are handling something correctly. This is defensive documentation.
The BCC field
BCC is blind carbon copy. The recipient does not know who else received the email. This makes it the most powerful and most sensitive field in the email client.
Legitimate uses: sending a mass email where recipients should not see each other's addresses, forwarding a conversation to someone without alerting the original sender.
Sensitive uses: documenting a conversation without the other party's knowledge. This is technically permitted. Whether it is appropriate depends on the context and the relationship.
The escalation CC
Adding someone's manager to an email without warning is a significant escalation. It signals that the normal communication channel has failed and a higher level of authority is being invoked. It should be used deliberately, not reflexively.
If you are going to escalate, consider whether a direct conversation would be more effective first.
The rule: Before adding someone to CC or BCC, ask what you want them to do with the information. If the answer is "nothing," consider whether they need to be included at all.