不知道为什么要这么做，姑且做个备忘。
可选步骤：使用外部SMTP服务器
建立文件 /etc/postfix/sasl_passwd ，内容为
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[smtp.server.domain]:port username:password |
建立对应的Hash DB
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postmap /etc/postfix/sasl_passwd |
控制访问权限（里面有明文密码）
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chown root:root /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db chmod 0600 /etc/postfix/sasl_passwd /etc/postfix/sasl_passwd.db |
打开配置文件 /etc/postfix/main.cf ，新建/更改行
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# SMTP server relayhost = [smtp.server.domain]:port # enable SASL authentication smtp_sasl_auth_enable = yes # disallow methods that allow anonymous authentication. smtp_sasl_security_options = noanonymous # where to find sasl_passwd smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd # Enable STARTTLS encryption smtp_use_tls = yes # where to find CA certificates smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt |
配置本地邮件转发
设立转发配置文件 /etc/postfix/virtual ，内容：
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# Single receiver, more than 1 forwarding destination me@example.org destination@gmail.com dest2@gmail.com # Wildcard username @example.org destination@gmail.com |
同样建立Hash DB：
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postmap /etc/postfix/virtual |
修改配置文件：
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# forwarding server virtual_alias_domains = localhost_hostname virtual_alias_maps = hash:/etc/postfix/virtual # Enable TLS smtp_use_tls=yes smtp_tls_security_level = encrypt smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt |
重启一下服务
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systemctl restart postfix.service |