Allowlist

What is it?

What is it?

An "Allowlist" is a security measure used in digital communications and IT environments to specify which users, IP addresses, email addresses, or applications can access a particular system, network, or service. This approach is based on the principle of explicit permission, meaning only entities on the allowlist can gain access, while all others are blocked by default.

Key points to remember

Key points to remember

  • Enhanced Security: By only allowing access to known, trusted entities, allowlists significantly reduce the risk of unauthorized access, spam, and cyber attacks.

  • Email Deliverability: In email marketing, adding a sender's email address to an allowlist can improve deliverability by preventing emails from being marked as spam.


  • Controlled Access: Allowlists give administrators precise control over who can access their systems, offering a straightforward way to manage permissions.


  • Requires Regular Updates: To be effective, allowlists must be regularly updated to accommodate new users or services and remove those no longer required.


  • Can be Combined with Blocklists: For robust security, allowlists, which explicitly deny access to certain entities, are often used with blocklists.

Example of Use

Example of Use

  1. Network Security: A company sets up an allowlist for its corporate VPN, ensuring only employee devices with registered IP addresses can access the internal network.


  2. Email Campaigns: An online retailer advises subscribers to add their sending email address to their email client's allowlist to ensure promotional emails do not end up in the spam folder.

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