Author: Pankaj Kumar

Unfortunately, there is an another incident of data breach. This time Twilio which has disclosed that attackers tricked an employee into sharing their credentials. Meaning allowing them to access information for a “limited number” of customers. A ‘sophisticated’ SMS phishing attack on Twilio employees allowed hackers to access some customer data. The company said it has been notifying affected customers individually. “If you are not contacted by Twilio, then it means we have no evidence that your account was impacted by this attack,” the company said. The company did not disclose how many customers were affected or what types of…

‘Hygiene’ is the word which has it’s own importance everywhere, whether it’s your personal things or your work place/culture or marketing ways. You need to follow some good steps to become successful towards your goals. When it comes email marketing it becomes even more important. Cleaning your email list regularly is the key to successful deliverability in many ways. Building a quality email list can feel like it’s as much an art as it is a science, and the result is exceptional deliverability and a higher ROI for your email marketing program. You must have noticed that engagement pattern changes…

4.7.8 Email Bounce Error Reason User Authentication Failed: Delayed Message The email message has not yet been delivered because the sender’s email program did not provide your correct username and password to the sender’s email system, which requires these to prove your identity. How to fix? In the sender’s email program’s account settings, look for “SMTP” (which is about sending email) and, in the SMTP area, “authentication”. Ensure that the username and password are entered correctly there. If this error persists, contact the email provider for help. 4.7.8- Official definition from ITEF For the code that starts from 4.X.X A…

4.7.7 Email Bounce Error Reason Potentially Corrupt Message: Delayed Message The email message has not yet been delivered because an email server involved with sending the message had difficulty processing the security features of the message. The message was possibly corrupt or altered in some way during sending. How to fix? If intentionally sending ecrypted email messages, check the sender’s email program settings and make necessary changes. Retry the email message see if the same error occurs, or if it was a one time problem. Otherwise, contact the sender’s email support team or encryption provider to help identify any misconfiguration…

4.7.6 Email Bounce Error Reason Message Encryption Issues: Delayed Message The email message has not yet been delivered because an email server involved with sending the message had difficulty processing the security features of the message. How to fix? If intentionally sending ecrypted email messages, check the sender’s email program settings and make necessary changes. Retry the email message see if the same error occurs, or if it was a one time problem. Otherwise, contact the sender’s email support team or encryption provider to help identify any misconfiguration with the sender’s account or encryption tools. 4.7.6- Official definition from ITEF…

4.7.5 Email Bounce Error Reason Message Authentication Issues: Delayed Message The email message has not yet been delivered because your email sending system uses DKIM, an authentication mechanism. Either the sending or receiving email system had some problem with the sending system’s DKIM. How to fix? Check if it is one time issues – retry sending message again after few hours. If problem persists you may need to dig out further to make sure it doesn’t have DKIM issues. If the problem continues, contact the sender’s email support team to help identify any misconfiguration with the sender’s account or with…

4.7.4 Email Bounce Error Reason User Authentication For Message Failed: Delayed Message The email message has not yet been delivered because there was a problem with your user authentication to your email system How to fix? Review the email account settings. Check for options that require “user authentication” for outbound SMTP and ensure that the Username and Password values are correct. If the account settings are correct, contact the email provider to help identify any misconfiguration with the sender’s account or with the email system. 4.7.4- Official definition from ITEF For the code that starts from 4.X.X A persistent transient…

4.7.3 Email Bounce Error Reason Security conversion required but not possible: Delayed Message The email message has not yet been delivered because the recipient’s email program and the sender’s email program had issues with the security protocols between them. How to fix? Retry the email message see if it was a one-time problem or if the same error occurs. Otherwise, contact the support team as the email system may have a security issue. This is not typically something that you can fix. 4.7.3- Official definition from ITEF For the code that starts from 4.X.X A persistent transient failure is one…

4.7.2 Email Bounce Error Reason Not Authorised To Send To Mailing List: Delayed Message The email message has not yet been delivered because the recipient’s email provider has blocked your email address from posting messages to this mailing list. How to fix? If it seems unlikely that your email address has been blocked intentionally, try sending the message again in a while in case this is a temporary problem. Otherwise, contact the mailing list administrator. 4.7.2- 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…

4.7.1 Email Bounce Error Reason Message Sender Blocked By Receiving Server: Delayed Message The email message has not yet been delivered because the recipient’s email provider is not accepting messages from this sender. This usually means that the receiving system has security or policy concerns with regard to either the specific sender, recipient, or the sender’s email system. How to fix? Retry the email message see if it was a one-time problem or if the same error occurs. Otherwise, contact the sender’s email support team as the email system may have a security issue. This typically requires help-desk support. 4.7.1-…