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

Field Description Visibility
To Primary recipient of the message Visible to all
Cc Copy of the message sent to additional recipients Visible to all
Bcc Blind copy Only the sender can see the addresses

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 Ireland, email addresses are considered personal data under the GDPR and Ireland’s Data Protection Act 2018. By using blind carbon copy (Bcc), the addresses remain hidden from other recipients. This reduces the risk of unintentional data disclosure and supports compliance with data protection principles, 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 phishing and other attacks: If address lists are sent in a way that makes them visible to all recipients, third parties may collect the addresses and use them for phishing, malware 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:

Bcc bulk email Email marketing software
No personalisation Personalised greeting
No reporting Open and click rates
High spam risk Optimised delivery
Manual Automated scheduling

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?

Advantages Disadvantages
The Bcc function protects privacy and, when used correctly, helps reduce spam – for example, as an alternative to an open email distribution list. For recipients of a blind carbon copy, it is usually not apparent that someone has been addressed via Bcc.
The Bcc field makes it possible to include anonymous third parties. Bcc contacts can jump into the communication at any time via ‘Reply all’, thereby revealing their status as secret readers.
Using the Bcc line can lead to misunderstandings if used incorrectly.
Tip

Use blind carbon copies primarily for bulk Bcc email messages to people who do not know each other. For transparent communication within a team, however, the Cc field is usually the better choice.

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