I was lucky that able to get 1 month free subscriptions on Qwiklabs and finished some of their quest. Good way to get your hand dirty and know how to use these tools. Sadly that promotion ended 31th July. Kubernets is really changing the way of software deployments. Docker was starting to popular 4-5 years …
CentOS 6 1. 移除sendmail 安裝postfix
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# /etc/init.d/sendmail stop # yum remove sendmail # yum install postfix cyrus-sasl mailx |
2. Gmail username and password Simple Authentication and Security Layer (SASL)
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# echo "smtp.gmail.com GMAIL_USERNAME:GMAIL_PASSWORD" > /etc/postfix/sasl_passwd # chmod 600 /etc/postfix/sasl_passwd # postmap hash:/etc/postfix/sasl_passwd |
3. Postfix 設定 vim /etc/postfix/main.cf
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myhostname = xxxx.hang321.net mydomain = hang321.net # use Gmail SMTP server. Remember to set on Google to allow access with less secure method relayhost = smtp.gmail.com:587 smtp_use_tls = yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous # set the required TLS options smtp_tls_CApath = /etc/ssl/certs smtp_tls_security_level = secure smtp_tls_mandatory_protocols = TLSv1 smtp_tls_mandatory_ciphers = high smtp_tls_secure_cert_match = nexthop |
CApath here, not CAfile 4. 重新啟動Postfix
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# service postfix restart |
5. Google 安全性設定 https://myaccount.google.com/security 「我的帳戶」> 「低安全性應用程式」專區 > 「安全性較低的應用程式存取權限」旁邊的 [啟用] 6. 測試mail server 是否有正常寄信 寄信俾自己
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Testing email, tail -f /var/log/maillog to see the result. # echo "body of your email" | mail -s "This is a Subject" [email protected] |
後記: Goolge 可能係最近才有這個安全性設定，大多數reference 都沒有提及，搞到我白忙一場。 不同Linux distro, CA file name 有分別。
goo.gl/a1ZC represent here ~ by Google URL Shortner