确认投递费 recorded delivery charge
国际确认投递函件 recorded delivery correspondence
投递确认 Delivery Confirmation ; DC
确认投递
Confirm delivery
以上为机器翻译结果，长、整句建议使用 人工翻译 。
var/log/maillog 中记录的 Sendmail 活动也确认邮件成功地投递到了 sapaix01 的端口 25250。
Sendmail activity, in /var/log/maillog, also confirmed that mail was being successfully delivered to sapaix01 on port 25250.
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