What is BCC and how does it work in emails?

Bcc stands for ‘Blind Carbon Copy’ and refers to a blind copy in an email. Re­cip­i­ents in the Bcc field also receive the message, but their email addresses remain hidden from all other re­cip­i­ents. This function is primarily used to send mass emails in com­pli­ance with data pro­tec­tion reg­u­la­tions or to protect recipient lists.

What does Bcc mean?

The ab­bre­vi­ation Bcc stands for ‘Blind Carbon Copy’. The term ori­gin­ates from the use of carbon paper to duplicate written documents. Unlike the Carbon Copy function (Cc), where a copy of the message is visible to all CC re­cip­i­ents, a Bcc recipient’s address remains hidden from everyone else.

The three key address fields at a glance

When does it make sense to use the Bcc function?

Bcc re­cip­i­ents receive copies of emails addressed to other people without those people being informed. In certain com­mu­nic­a­tion situ­ations, this has a clear practical function – spe­cific­ally whenever email addresses need to be protected. Three main motives are key here:

• Data pro­tec­tion: In the UK, email addresses are con­sidered personal data under the UK GDPR. By using blind carbon copy (BCC), the addresses remain hidden from others. This reduces the risk of un­in­ten­tion­al data dis­clos­ure and complies with the prin­ciples of data pro­tec­tion, par­tic­u­larly data min­im­isa­tion.
• Spam pre­ven­tion: Mass emails in which all addresses in the dis­tri­bu­tion list are visible in the To or Cc field can be easily forwarded or misused.
• Pro­tec­tion against malware: If address lists are sent in a way that makes them publicly visible, third parties can auto­mat­ic­ally collect them and use them for attacks or pro­mo­tion­al emails.

How to add a blind copy

Most email programs hide the Bcc field by default. However, you can display it with just a few clicks:

• Outlook: New email → ‘Options’ → ‘Bcc’
• Gmail: New message → click ‘Bcc’ to the right of the ‘To’ field
• Webmail in­ter­faces (e.g., browser-based email inboxes): When composing the message, activate the ‘Bcc’ option

Mobile email apps:

• Outlook app: → Tap the arrow icon next to ‘To’ → Select ‘Bcc’ and add people
• Gmail app: → Click on the ‘Cc/Bcc, From:’ field and enter the desired contacts

The message will be delivered as usual, without other people being able to see this address.

What are typical use cases for Bcc?

The Bcc field is ideal for sending mass emails to large groups of re­cip­i­ents who do not interact with each other. Common examples include:

• In­vit­a­tions or event an­nounce­ments to external re­cip­i­ents
• In­form­a­tion­al emails to customers or business partners
• Club or school dis­tri­bu­tion lists
• One-time messages to multiple re­cip­i­ents

For instance, if you want to send a Christmas greeting to customers, business contacts, and suppliers, you might skip per­son­al­ised messages and send everyone the same Bcc email. Would you address all the contacts in the visible To field or via Cc? Likely not. To protect your customers’ data and maintain con­fid­en­ti­al­ity in business re­la­tion­ships, the Bcc field is the right choice.

Data pro­tec­tion isn’t only a business issue. For instance, when a teacher sends in­form­a­tion or meeting minutes from a parent-teacher meeting, they should avoid using Cc for the contact list and opt for Bcc instead. This helps keep recipient data private and prevents email addresses from being exposed un­ne­ces­sar­ily.

When should Bcc not be used?

The blind carbon copy is generally un­suit­able for internal com­mu­nic­a­tion. Email copies help keep employees and managers informed about work processes, ensuring trans­par­ency. However, the Bcc function un­der­mines trans­par­ent com­mu­nic­a­tion. Therefore, avoid using Bcc when re­cip­i­ents need to actively col­lab­or­ate or respond to each other, such as during project co­ordin­a­tion, team dis­cus­sions, or joint decision-making processes.

Another thing to consider is that Bcc re­cip­i­ents are not auto­mat­ic­ally included when using the ‘Reply all’ function. This can lead to confusing reply chains or result in important in­di­vidu­als missing out on follow-up in­form­a­tion.

Where to draw the line regarding Bcc and news­let­ters

For oc­ca­sion­al small bulk emails, using blind carbon copy (BCC) is suf­fi­cient. However, when sending emails to large groups on a regular basis, Bcc quickly becomes less effective:

For regular mailings, it is advisable to use email marketing software, which enables you to manage recipient lists in ac­cord­ance with data pro­tec­tion reg­u­la­tions and send emails in an organised manner.

What are the ad­vant­ages and dis­ad­vant­ages of Bcc?