Troubleshoot Issues Sending an eFax - Fax03
Discover effective approaches for resolving problems sending eFax documents.
Written by Adrian Angwenyi
Updated at May 19th, 2025
Table of Contents
Note
This method of faxing through email is specifically for customers using the Fax03 solution for their faxes. If you are not using Fax03, please see our articles referencing StratusFax.
Where to Start
When there are issues sending faxes through email, there are several things that you can check to ensure you are using your fax to email service effectively.
Are You Sending the eFax in the Correct Format?
To use our fax-to-email service, you just need access to a webmail service (e.g., Outlook, Gmail, etc.) so that an email can be composed and formatted as an eFax.
To send a fax correctly, you will need to send an email in this format:
-
To: [Destination 10-digit fax#]@theirfax.com
For example…
If you are sending a fax to 800-555-1212, the email's recipient would be 8005551212@theirfax.com - Subject: Type a subject for the fax (e.g., “ATTN: [Name]")
- Email body: To create a Cover Letter, type text here.
- PDF Attachment: Attach the document that will be faxed.
Is Your Number Set up for eFaxing?
In order to have a phone number used for faxing, the phone number has to be configured and routed accordingly.
Please contact support at support@spectrumvoip.com or call (469) 429-2500 to speak with a member of our support team to verify if your phone number is ready for faxing.
Is Your Email Address Added to a SpectrumVoIP's eFax Account?
Simply sending an email in the correct format will not send an eFax. Your email address will need to be listed in a SpectrumVoIP fax to email account and associated with an eFax number.
During the creation of a fax to email account, a list of email addresses is usually requested. If this list of email addresses needs to be checked or updated, please contact our Technical Support team by emailing support@spectrumvoip.com or calling (469) 429-2500.
WARNING: If your email address is not added to a fax-to-email account, then you will not receive an email to confirm that your eFax was sent.
Are You Using an Encrypted Email Client?
Some organizations may require a more secure webmail service to be used instead of Gmail or Outlook. These email services may over-encrypt outbound emails to the point where SpectrumVoIP's eFax Service is unable to process the email. These services are typically labelled as “HIPAA-compliant”, “secure email encryption”, or "data protection".
Some of these services that commonly cause issues include (but are not limited to):
- Paubox
- LuxSci
If you are utilizing a secure webmail service that may be causing faxing issues, contact our support team to see if there is a solution that can be implemented.