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允许用户无需身份验证发送邮件

创建文本文件 /etc/postfix/accepted_unauth_senders,列出无需身份验证就可以 发送邮件的用户邮件地址。下面以用户 user@example.com 为例:

user@example.com OK

使用 postmap 命令建立哈希数据库文件:

# postmap hash:/etc/postfix/accepted_unauth_senders

修改 Postfix 配置文件 /etc/postfix/main.cf 以使用该文件:

smtpd_sender_restrictions =
    check_sender_access hash:/etc/postfix/accepted_unauth_senders,
    [...OTHER RESTRICTIONS HERE...]

重启 postfix 服务以使设置生效:

# /etc/init.d/postfix restart

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