用 Resend + Cloudflare 给自己的域名配置 SMTP 发信
这是一份偏实战的记录：目标是让自己的站点可以用 xxx@your-domain.com 发送注册验证码、余额提醒、系统通知等邮件。这里以 Resend + Cloudflare DNS 为例，截图里的账号、长 DKIM、公网配置等关键信息已经做了打码或缩略，实际配置时请以你自己
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