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Date: Sun, 3 Nov 2019 17:08:27 +0200
To: [email protected]
From: "קצביית השף" <[email protected]>
Subject: כמעט אצלך! הזמנתך מקצביית השף בתהליך משלוח!
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As you can see there's a 4 minute delay in Hop 3 (also why's the from column in that hop empty?)
What could be causing this delay?
Delivery delays are simply an inherent part of how SMTP works. Unlike protocols like HTTP, which connect and happen more or less immediately, even through chains of proxies, messages sent by SMTP can be held up for long periods at any point in their journey. During this time they may be written to disk by any intermediate relaying server and ignored for a while, then picked up and delivery retried later on. This can all happen in seconds, and often does, but you can't rely on it - there is nothing in SMTP preventing it from taking days.
As a sender, you have little control over this, other than by trying to avoid bottlenecks that you do have control over, such as ensuring that you are sending through a well-connected relay with a long history of not sending spam.
Large ISPs like Google and Yahoo often use SMTP delivery deferrals (where the receiving server says "I'm busy right now, come back later") as a means of rate-limiting senders they disapprove of for some reason, e.g. they are sending too much, using too many connections, or receivers are reporting messages as spam.
In short, adjust your expectations; delays like this are common, and what you are seeing is perfectly normal.