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Hide recipient addresses in an email

Update 02/27/2026

This guide details the different ways to address an email to multiple recipients, including masking the email addresses of other participants.

 

Preamble

  • When you send emails, it is sometimes necessary to include multiple recipients using the fields:
    • À
    • CC:
      • French: Copie Conforme
      • English: Carbon Copy
    • BCC:
      • French: Copie Conforme Invisible
      • English: Blind Carbon Copy
  • Do not overload the To and CC fields with recipients who are not directly concerned by the email.
  • Use the BCC field to protect the email addresses of recipients when there are multiple people in the list.
  • For multiple, recurring and/or important sends, beyond the imposed limits, it is recommended to use more suitable tools instead:

 

Understanding and using these 3 email fields

The To field

This field is used to indicate the main recipient(s) of the email, those who receive the email as a direct copy.

  • Use this field for main recipients who are directly concerned by the content of the email.
  • Examples: work meeting, project report, direct communication with a client.

The CC field

Used to send a copy of the email to other people in addition to the main recipients. All recipients can see who received a copy of the email.

  • Use this field to include secondary recipients who need to be informed but are not the main actors in the discussion.
  • Example: informing a supervisor about a conversation, including colleagues interested in the subject without them needing to intervene.

The BCC field

Used to send a copy of the email to people without the other recipients knowing they have also received the email.

  • Use this field to include recipients who need to receive the email without the other recipients knowing.
  • Example: sending an email to a group with a supervisor in CCI for follow-up, avoid disclosing email addresses to all recipients (often used in mass emails).

 

Use the fields available on Mail Infomaniak

To access the appropriate fields in your Infomaniak mailbox:

  1. Click here to access the Web app Mail Infomaniak (online service ksuite.infomaniak.com/mail).
  2. Click on New message.
  3. Click on CC & BCC:
  4. The additional fields appear, they will allow you to insert the email addresses of your recipients:

 

Usage examples

Each of these fields has a specific function and can be used strategically depending on the context of your communication. Be transparent and ethical in the use of the BCC field to avoid misunderstandings or conflicts:

  • Team communication
    • To: main project members
    • CC: Project manager, other concerned departments
    • BCC: Director for information without direct intervention
  • Marketing email
    • To: do not use (or simply indicate the sender's email address)
    • CC: do not use
    • BCC: list of subscribers to protect individual email addresses
  • Important announcement
    • To: main recipients (e.g.: directors)
    • CC: board members, key collaborators
    • BCC: other stakeholders for confidential information
  • Meeting announcement
    • To: John Doe, Jane Smith
    • CC: project.manager@company.com
    • BCC: director@company.com
  • Event invitation
    • To: main guests
    • CC: coordination@event.com
    • BCC: list of secondary guests (to protect email addresses)

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