> Good for you, but, I guess you are using mailgun for outgoing. Yes, it is real good for me. $ cat /etc/postfix/sender_relay (Postfix in Google Compute Engine) soyeomul@yw.doraji.xyz [smtp.mailgun.org]:2525 soyeomul@bullseye.yw.doraji.xyz [email-smtp.eu-west-1.amazonaws.com]:2587 soyeomul@red-october.yw.doraji.xyz [email-smtp.us-east-1.amazonaws.com]:2587 Sincerely, Linux fan Byung-Hee -- ^고맙습니다 _和合團結_ 감사합니다_^))//