Failed: siambit05-vip@yahoo.com → tumoil2529@gmail.com 'รายละเอียดการแจ้งการโอนเงิน Si@mBIT ภายนอก' Server response: 550 550 5.7.1 Unauthenticated email from yahoo.com is not accepted due to domain's 5.7.1 DMARC policy. Please contact administrator of yahoo.com domain if 5.7.1 this was a legitimate mail. Please visit 5.7.1 https://support.google.com/mail/answer/2451690 to learn about DMARC 5.7.1 initiative. a14si4726121ioj.43 - gsmtp