A knowledge centre of email
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 […]
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 […]
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. […]
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 […]
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 […]
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 […]
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 […]
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 […]
4.7.0 Email Bounce Error Reason Unknown Security Or Policy Concern: Delayed Message The email message has not yet been delivered because the message has caused a security concern, but it is not clear what caused the problem. How to fix? Retry the email message see if it was a one-time problem or if the same […]
4.6.6 Email Bounce Error Reason Email Content Could Not Be Accessed: Delayed Message The email message has not yet been delivered because an email system involved in transmitting the message had a problem accessing its content. How to fix? Try sending the message again in a while as this problem might be temporary or already […]