Delayed Message: Network connection timed out

The email message has not yet been delivered because the sender's email provider and the recipient's email provider got disconnected before the message had been handed over for delivery.

Fixes

The sender's email system will retry this message a few more times and provide further updates.

if the sender is not notified within a few days that the message was delivered, try sending it again. Or contact the recipient another way, such as phone or text message.

4.4.2: Official Definition

[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that start with 4.X.X:

A persistent transient failure is one in which the message as sent is valid, but persistence of some temporary condition has caused abandonment or delay of attempts to send the message. If this code accompanies a delivery failure report, sending in the future may be successful.

[RFC3463] (Standards Track) from the The Internet Engineering Task Force (IETF) definition for codes that end with X.4.2:

The outbound connection was established, but was unable to complete the message transaction, either because of time-out, or inadequate connection quality. This is useful only as a persistent transient error.

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