是什么导致接收 phpmailer 发送的邮件延迟 4 分钟？
What's causing a 4 minute delay in receiving mail sent by phpmailer?
这是电子邮件 header:
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Date: Sun, 3 Nov 2019 17:08:27 +0200
To: itailaitner12345@gmail.com
From: "קצביית השף" <support@chefsbutcher.co.il>
Subject: כמעט אצלך! הזמנתך מקצביית השף בתהליך משלוח!
Message-ID: <e3b476543d89e53426eaeeb9426fa8e1@chefsbutcher.co.il>
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如您所见，第 3 跳有 4 分钟的延迟（另外为什么该跳的 from 列为空？）
可能是什么原因导致了这种延迟？
传递延迟只是 SMTP 工作方式的固有部分。与 HTTP 这样的协议不同，它或多或少会立即连接并发生，即使通过代理链，SMTP 发送的消息可以在其传输过程中的任何时间点延迟很长时间。在此期间，它们可能会被任何中间中继服务器写入磁盘并暂时忽略，然后拾取并稍后重试传送。这 可以 都在几秒钟内发生，而且经常发生，但您不能依赖它 - SMTP 中没有任何东西可以阻止它花费 天 .
作为发件人，您对此几乎没有控制权，只能尝试避免您确实可以控制的瓶颈，例如确保您通过连接良好且长期不发送的中继发送垃圾邮件。
像 Google 和 Yahoo 这样的大型 ISP 经常使用 SMTP 传递延迟（接收服务器说 "I'm busy right now, come back later"）作为他们出于某种原因不赞成的限速发件人的手段，例如他们发送的邮件过多，使用的连接过多，或者收件人将邮件报告为垃圾邮件。
总之，调整你的预期；像这样的延迟很常见，您所看到的是完全正常的。
4 分钟的延迟是一种特定的反钓鱼隔离措施，会影响某些类型的带有按钮和链接的电子邮件。它与 SMTP 的工作方式无关。
https://www.welivesecurity.com/2017/06/01/ongoing-phishing-fight-google-delay-delivery-suspicious-messages-enterprise-gmail-customers/
这是电子邮件 header:
Delivered-To: itailaitner12345@gmail.com
Received: by 2002:a25:ad43:0:0:0:0:0 with SMTP id l3csp3055642ybe;
Sun, 3 Nov 2019 07:12:29 -0800 (PST)
X-Received: by 2002:adf:f70f:: with SMTP id r15mr20367618wrp.262.1572793709683;
Sun, 03 Nov 2019 07:08:29 -0800 (PST)
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X-Received: by 2002:adf:f70f:: with SMTP id r15mr20367571wrp.262.1572793708960;
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Date: Sun, 3 Nov 2019 17:08:27 +0200
To: itailaitner12345@gmail.com
From: "קצביית השף" <support@chefsbutcher.co.il>
Subject: כמעט אצלך! הזמנתך מקצביית השף בתהליך משלוח!
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如您所见，第 3 跳有 4 分钟的延迟（另外为什么该跳的 from 列为空？）
可能是什么原因导致了这种延迟？
传递延迟只是 SMTP 工作方式的固有部分。与 HTTP 这样的协议不同，它或多或少会立即连接并发生，即使通过代理链，SMTP 发送的消息可以在其传输过程中的任何时间点延迟很长时间。在此期间，它们可能会被任何中间中继服务器写入磁盘并暂时忽略，然后拾取并稍后重试传送。这 可以 都在几秒钟内发生，而且经常发生，但您不能依赖它 - SMTP 中没有任何东西可以阻止它花费 天 .
作为发件人，您对此几乎没有控制权，只能尝试避免您确实可以控制的瓶颈，例如确保您通过连接良好且长期不发送的中继发送垃圾邮件。
像 Google 和 Yahoo 这样的大型 ISP 经常使用 SMTP 传递延迟（接收服务器说 "I'm busy right now, come back later"）作为他们出于某种原因不赞成的限速发件人的手段，例如他们发送的邮件过多，使用的连接过多，或者收件人将邮件报告为垃圾邮件。
总之，调整你的预期；像这样的延迟很常见，您所看到的是完全正常的。
4 分钟的延迟是一种特定的反钓鱼隔离措施，会影响某些类型的带有按钮和链接的电子邮件。它与 SMTP 的工作方式无关。
https://www.welivesecurity.com/2017/06/01/ongoing-phishing-fight-google-delay-delivery-suspicious-messages-enterprise-gmail-customers/