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How to Add your Email Domain for Outbound Email-to-Fax

This tutorial explains the steps to creating and validating your email domain in order to fax via email through your etherFAX account.

Info, Notes and Warnings

At this current time, Outbound DirectFax Email Services are only available for Microsoft 365 and Google Workspace email systems.

Successful completion of these steps does not mean that email-to-fax is ready.

A connector must be made from your email environment as well. More details at the end of the article in the Ending Notes and Details section.

There are billing implications to setting up an Email Domain on your account. Please make sure this is squared away to avoid any billing issues.


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

  • Your account is enabled to add an Email Domain entry along with having a portal user with the ability to add the entry.
    A billing agreement in place for the DirectFax outbound email-to-fax service.

If you are using Microsoft 365:

  • SPF (Sender Policy Framework) established as per Microsoft’s instructions here.

  • DKIM (DomainKeys Identified Mail) established as per Microsoft’s instructions here.

If you are using Google Workspace:

  • SPF (Sender Policy Framework) established as per Google’s instructions here.

  • DKIM (DomainKeys Identified Mail) established as per Google’s instructions here.


How to add your email domain for outbound email-to-fax

  1. Sign into your etherFAX account at

  2. Under Endpoints select Email Domains.

  3. In the upper-right corner select + Email to Fax Domain.

  4. Within Email Domain, enter the domain of your email address. For example, if an email in this domain is then you would enter, verbatim. There is no need to include the @ symbol.

  5. Enter your preference of a Description along with a Caller ID. The Caller ID and Local ID will be used across all email-to-fax submissions relating to this domain as this is a global setting.

  6. When inputting a Validation Email Address, it will have to be a legitimate address at the same Email Domain. In our case, this is where we would use

  7. If you wish to be notified about your outbound fax status when complete, toggle Return Receipt on. If all looks well, click Save. Below is an example of what our entry looks like:


  8. An email is then sent out to the Validation Email Address. This recipient will have to reply to that email in order to validate that domain. If SPF/DKIM are established, your domain will now become validated.

    Revisit your entry in Endpoints > Email Domains to confirm that the validation was successful—if a date is found in the Registered column, the registration was successful.

You have now successfully established your email domain with etherFAX!

Ending Notes and Details

Step 8 will fail if SPF and DKIM is not set up within your email tenant. Please refer to the Prerequisites section for articles on how to address this.

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