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taro.jfd.mail@gmail.com (expanded from fujikawa@deaf.tokyo): host gmail-smtp-in.l.google.com[142.251.169.27] said: 550-5.7.26 Unauthenticated email from example.com is not accepted due to 550-5.7.26 domain's DMARC policy. Please contact the administrator of 550-5.7.26 example.com domain if this was a legitimate mail. To learn about the 550-5.7.26 DMARC initiative, go to 550 5.7.26 https://support.google.com/mail/?p=DmarcRejection 41be03b00d2f7-cb5174ced62si12789762a12.76 - gsmtp (in reply to end of DATA command)