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How to Block a Sender by Caller ID

This tutorial provides instructions on how to block incoming faxes based on the sender’s Caller ID.

Info, Notes and Warnings

This affects the entirety of the etherFAX account where this is applied.

Blocks cannot be made specific to the etherFAX number that is dialed as this is a global setting that affects all etherFAX numbers on the account where the block placed.


Before reading these instructions be sure that the following prerequisites are met:

  • An etherFAX account.

  • An etherFAX portal user.

    • The Global Administrator, or

    • one with the Edit Customer role.

  • The Caller ID of the sender(s) to block.


How to block a sender by Caller ID

  1. Sign into the etherFAX Client portal at

  2. On the left-hand side select Blocking, then Inbound:

  1. Next, click on the + Add Item button beneath Deny List. A pop-up titled Add Inbound Deny List Item will appear.

  2. Select the Country Code drop-down, then select the country code of the number you wish to block.

  3. Enter the rest of the number you wish to block (avoiding dashes and parenthesis). Click Add to List:

To avoid redundancy and possible errors be sure not to include the country code within the Enter number * field.

  1. From here you can add additional entries, filter and search, or delete records by using the trash icon on the right-hand side.

You have just successfully learned how to block incoming fax numbers to an etherFAX account!

Ending Notes and Details

This action busies out incoming faxes from senders based on their Caller ID.

If it is preferred to block all incoming faxes by all senders unless specified, then the following knowledge article will assist: How to Block All Senders Unless Permitted.

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