Delivery Status Notification (Failure)
550 5.7.26 Unauthenticated email from medi.com.co is not accepted due to domain's DMARC policy. Please contact the administrator of medi.com.co domain if this was a legitimate mail. Please visit https://support.google.com/mail/answer/2451690 to learn about the DMARC initiative. k8sor1812313ybh.196 - gsmtp