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Emails Bouncing per DMARC

2014-05-07 10:29 am EST

Hits: 1,102
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,


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Best answer chosen by User


11,186 Points
2014-05-07 11:36 am EST
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.

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Should this be configured for an external SMTP server? I have been using the PHP mail function to send emails. If SMTP, what is the correct server name?
22 Points
2014-05-07 12:33 pm EST
You will be configuring it to whatever SMTP server is associated with the mailbox that you are sending from. In the example you provided, you were trying to send from a Yahoo address in which you would then use the Yahoo SMTP settings provided to you by them. If you are using an account with us, you would typically use as the server, and authenticate using your email address and password for that account.
11,186 Points
2014-05-07 1:24 pm EST
Thanks, Jeff. Set up user and password in email client in acymailer and found yet another yahoo address in the newsletter stats to change. Worked fine after that.
22 Points
2014-05-07 7:37 pm EST
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