Trustfax has email to fax that allows you to fax through trustfax using your email rather than using the trustfax website. Email to fax is allowed from any email addresses and is not limited to the email address listed in your account. Failed faxes by email receive a return email with an error message.
Please contact
support@trustfax.com with the information about your email to fax so that support can check out the reason for the failure. You can forward the sent email to fax email as this will assist support with your issue.