Notifications from email events fail to send

  • 24 February 2022
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Notifications from email events fail to send out

This article was created in response to a support issue logged with K2. The content may include typographical errors and may be revised at any time without notice. This article is not considered official documentation for K2 software and is provided "as is" with no warranties.


This article has been archived, and/or refers to legacy products, components or features. The content in this article is offered "as is" and will no longer be updated. Archived content is provided for reference purposes only. This content does not infer that the product, component or feature is supported, or that the product, component or feature will continue to function as described herein.


Notifications from Email Events are not getting sent out and the workflow goes into an error state with the following error shown on K2 Workspace > Error Profiles:





From the K2 Host Server logs, the error below is logged at the same time: 


"SourceCode.Workflow.Common.SmtpMail","0 SMTP mail send failure: Verify the SMTP connection strings are correct and that SMTP is working properly. Exception: The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated"

Troubleshooting Steps

To resolve the issue, please complete the following steps:

1. Open the ConnectionStringEditor.exe in [Drive]:Program Files (x86)K2 blackpearlHost ServerBin


2. Modify each SMTP connection string and set Authentication to 'Plain' and input the UserID and Password used to authenticate with. 

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