Author: Pankaj Kumar

Pankaj Kumar is a senior professional holding 10+ years of experience in CRM, Email Deliverability & Marketing Analytics, Deliverability Onboarding, Implementation, Deliverability Automations He has worked with a broad range of clients to provide strategic, data-driven guidance to increase email delivery, subscriber engagement and revenue. He also helps marketers through this blogs in preparing strategies, data analytics, deliverability, and CRM with a passion for helping email marketers exceed subscriber expectations. You may connect with him on LinkedIn at https://www.linkedin.com/in/kumarpankaj793/

4.4.6 Email Bounce Error Reason Network Issue Caused A Mail Loop: Delayed Message The email message has not yet been delivered because there was a network issue that caused a routing loop, causing this message to be forwarded over and over. How to fix? Double check the recipient’s email address to make sure it is correct and attempt to resend the message 4.4.6- 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…

Read More

4.4.5 Email Bounce Error Reason Overloaded Network: Delayed Message The email message has not yet been delivered because the email system was unable to deliver the message due to recipient’s email network being congested or overloaded. How to fix? Try waiting a bit since the mail server is busy. The sender’s email provider will retry this message a few more times to see if the message gets through and provide further updates. 4.4.5- 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…

Read More

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.…

Read More

4.4.3 Email Bounce Error Reason Network Issue With The Receiving System: Delayed Message The email message has not yet been delivered because a network problem prevented the recipient’s email provider from delivering the message. How to fix? 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. 4.4.3- Official definition from ITEF For the code that starts from 4.X.X A persistent transient failure…

Read More

4.4.2 Email Bounce Error Reason Network Connection Timed Out: Delayed Message 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. How to fix? 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 from ITEF For the code that starts…

Read More

4.4.1 Email Bounce Error Reason Network Is Busy: Delayed Message The email message has not yet been delivered because the recipient’s email provider did not respond to the sender’s email provider’s request to connect. How to fix? 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. 4.4.1 – Official definition from ITEF For the code that starts from 4.X.X A persistent transient…

Read More

4.4.0 Email Bounce Error Reason Unknown Issue With Network Connection: Delayed Message The email message has not yet been delivered because of an unknown network connection problem between the email providers. How to fix? Contact the sender’s email or network support team as there was a network issue, possibly with the sender’s email server. This is typically something that needs help-desk support to resolve. 4.4.0 – 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…

Read More

4.3.4 Email Bounce Error Reason Message Is Too Large: Delayed Message The email message has not yet been delivered because the recipient’s email provider has a message size limit and the message is larger than what is allowed. How to fix? Check the body of the message for large amounts of text or for any large attachments. Try adjusting the text or reducing the size of attachments and resending. Otherwise, contact the sender’s email support team to see if they can help troubleshoot further. 4.3.4 – Official definition from ITEF For the code that starts from 4.X.X A persistent transient…

Read More

4.3.3 Email Bounce Error Reason Message Features Not Supported By Receiving System: Delayed Message The email message has not yet been delivered because the message seems to contain features not supported by the receiving system. Typically, this occurs when systems have differing capabilities. How to fix? Contact the sender’s email system support team to investigate what feature of your email system may not be supported by the receiving system. This usually requires some level of support to fix. 4.3.3 – Official definition from ITEF For the code that starts from 4.X.X A persistent transient failure is one in which the…

Read More

4.3.2 Email Bounce Error Reason Receiving Email System Not Operating: Delayed Message The email message has not yet been delivered because one or more of the recipients’ email systems is not accepting messages, possibly due to an unplanned shutdown, excessive load, or system maintenance. How to fix? Try sending the message again later or contact in other way. 4.3.2 – 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…

Read More