If you receive a bounce email similar to the one below when you try to send a fax, the SPF record for your domain is not configured correctly. You will need to contact the company that manages your DNS to properly configure your SPF record before you can end a fax. More information about how to configure the SPF record is here.
From: Mail Delivery System [mailto:MAILER-DAEMON@titaniumvfax.com]
Sent: Tuesday, November 17, 2015 5:23 PM
To: [Your Email Address]
Subject: Undelivered Mail Returned to Sender
This is the mail system at host titaniumvfax.com.
I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.
For further assistance, please send mail to postmaster.
If you do so, please include this problem report. You can delete your own text from the attached returned message.
The mail system
<faxparse@titaniumvfax.com> (expanded from <fax2135551212@titaniumvfax.com>):
Command died with status 1: "/home/faxparse/scripts/email2fax.py".
Command output: SPF records for sender are improperly configured
Final-Recipient: rfc822; faxparse@titaniumvfax.com
Original-Recipient: rfc822;fax2135551212@titaniumvfax.com
Action: failed
Status: 5.3.0
Diagnostic-Code: x-unix; SPF records for sender are improperly configured