Unauthenticated email from dumaxst.com is not accepted due to 550-5.7.26 domain's DMARC policy.

Unauthenticated email from dumaxst.com is not accepted due to 550-5.7.26 domain's DMARC policy.

Hi,

We use the mail to send automatic emails through the SMTP server, we use the following configuration:





We realize that most emails are being rejected.

Could you support us?

<miguel.ventas@tmgr.com.mx>: host ASPMX.L.GOOGLE.COM[108.177.127.26] said:
550-5.7.26 Unauthenticated email from dumaxst.com is not accepted due to
550-5.7.26 domain's DMARC policy. Please contact the administrator of
550-5.7.26 dumaxst.com domain if this was a legitimate mail. Please visit
550-5.7.26 https://support.google.com/mail/answer/2451690 to learn about
the 550 5.7.26 DMARC initiative. e14si967144edl.270 - gsmtp (in reply to
end of DATA command)