Email getting blocked by DMARC

Can anyone help me figure out why this is being blocked. It seem like a standard email and should not be rejected by DMARC. How can I fix this? thank you in advanced. See below…

---------- Forwarded message ---------
From: Mail Delivery System MAILER-DAEMON@zixmt1zixworkscom
Date: Mon, Feb 22, 2021 at 8:17 AM
Subject: Undelivered Mail Returned to Sender

This is the mail system at host out.zixmt1zixworkscom

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

tabordagdaniela03@gmailcom: host gmail-smtp-in.l.googlecom[]
said: 550-5.7.26 Unauthenticated email from is not accepted due
to domain’s 550-5.7.26 DMARC policy. Please contact the administrator of domain 550-5.7.26 if this was a legitimate mail. Please visit
550-5.7.26 o learn about
the 550 5.7.26 DMARC initiative. s5si10129403oth.324 - gsmtp (in reply to
end of DATA command)

Hi Larry,

Looks like there are issues with the SPF record. You can use either of these to check:

You’ve reached the 10 domain lookup for SPF. So some of the domains in your SPF are being ignored.
I would recommend that you should remove, as that is not the correct SPF value. Also, remove the ‘a’ tag. You already define two IP addresses which are within the ‘a’ tag. Not sure if that will get you to 10, but should be close.

I’m also assuming that you don’t have DKIM setup for all e-mail services. If that is the case, when SPF fails and there is no DKIM record, DMARC will fail.

Hope that helps.

  • Shehzad
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