4.4.4 Email Bounce Error
Reason
Email Routing Issue Due To Network: Delayed Message
The email message has not yet been delivered because network problems with the recipient’s email provider limit routing this message.
How to fix?
Try waiting a bit since the receiving mail server is busy. Also, double check the recipient’s email address when sending again.
4.4.4- Official definition from ITEF
For the code that starts from 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.
For the code that starts from X.4.4
The mail system was unable to determine the next hop for the message because the necessary routing information was unavailable from the directory server. This is useful for both permanent and persistent transient errors. A DNS lookup returning only an SOA (Start of Administration) record for a domain name is one example of the unable to route error.
5.4.4 Email Bounce Error
Reason
Email Routing Issue Due To Network: Message Not Delivered
The message could not be delivered because network problems with the recipient’s email provider limit routing this message.
How to fix?
The sender’s mail provider is working on the network related issues. If this error continues, double check the recipient’s email address for misspellings and consider contacting the recipient through an alternative email address or other means.
5.4.4- Official definition from ITEF
For the code that starts from 5.X.X
A permanent failure is one which is not likely to be resolved by resending the message in the current form. Some change to the message or the destination must be made for successful delivery.
For the code that starts from X.4.4
The mail system was unable to determine the next hop for the message because the necessary routing information was unavailable from the directory server. This is useful for both permanent and persistent transient errors. A DNS lookup returning only an SOA (Start of Administration) record for a domain name is one example of the unable to route error.
