Emails Bouncing per DMARC

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We use joomla acymailer to send out monthly church newsletters. The May newsletter was bounced by 40 of 85 subscribers. Typical message: "From: Mail Delivery System Date: Fri, May 2, 2014 at 4:03 PM Subject: Mail delivery failed: returning message to sender To: (bounce address) This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: (actual address) (ultimately generated from (bounce address) SMTP error from remote mail server after end of data: host []: 550-5.7.1 Unauthenticated email from is not accepted due to domain's 550-5.7.1 DMARC policy. Please contact administrator of domain if 550-5.7.1 this was a legitimate mail. Please visit 550-5.7.1 to learn about DMARC 550 5.7.1 initiative. tb3si362346pab.301 - gsmtp" Since the "from" was originally a address, I changed it to one of our own addresses but the test messages still bounce. I tried to add inmotion's outgoing email server to the SPF authentication list, but cpanel can not verify the numeric address: "Status: Enabled Warning: cPanel is unable to verify that this server is an authoritative nameserver for “”. [?] Your current raw SPF record is : v=spf1 +a +mx +ip4: ~all" What's next? Kind regards, Fred
The message regarding SPF is normal. It is not saying that it is incorrect, just saying that it cannot confirm if it is or not.

The bounceback you are receiving is due to sending from an unauthenticated user to Gmail's servers. To avoid this issue, be sure that your mail script fully connects to the server using the correct username and password for the email address that it is sending from.