Blocked senders

Email Security marks all messages from these senders with a disposition.

To configure blocked senders:

1. Log in to Zero Trust ↗.
2. Select Email Security.
3. Select Settings, go to Detection settings > Blocked senders.
4. On the Detection settings page, select Add a sender.
5. Select the Input method: Choose between Manual input, and Upload blocked sender list:
   • Manual input:
     • Sender type:
       • Email addresses: Must be a valid email.
       • IP addresses: Can only be IPv4. IPv6 and CIDR are invalid entries.
       • Domains: Must be a valid domain.
       • Regular expressions: Must be valid Java expressions. Regular expressions are matched with fields related to the sender email address (envelope from, header from, reply-to), the originating IP address, and the server name for the email.
     • Notes: Provide additional information about the blocked sender policy.
   • Upload blocked sender list: Upload a file no larger than 150 KB. The file cannot can only contain Blocked_Sender and Notes fields. The first row must be a header row.
6. Select Save.

Export blocked senders

To export a list of blocked senders:

1. On the Detection settings page, select the blocked senders you want to export.
2. Select Action.
3. Select Export to CSV.

Edit a blocked sender

To edit a blocked sender:

1. On the Detection settings page, select the blocked sender you want to edit.
2. Select the three dots > Edit.
3. Edit the blocked sender.
4. Select Save.

Delete a blocked sender

To delete a blocked sender:

1. On the Detection settings page, select the blocked sender you want to delete.
2. Select the three dots > Delete.
3. On the pop up message, select Delete.

To delete multiple blocked senders at once:

1. On the Detection settings page, under Blocked senders, select the senders you want to delete.
2. Select Action
3. Select Delete.

Was this helpful?

What did you like?

Accurate

Easy to understand

Solved my problem

Helped me decide to use the product

Other

What went wrong?

Hard to understand

Incorrect information

Missing the information

Other

Thank you for helping improve Cloudflare's documentation!