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    Nintex Knowledge Base

    Error "The message could not be delivered to one or more recipients" for a valid and active email address in Office 365

    Status: Validated

    ISSUE
    When using "Send an Email" action with a valid and active user in Office 365, the following error is occurred : 
    The message could not be delivered to one or more recipients
    ERROR CODE
    RESOLUTION
    • Make sure that the email is valid and active user. 
    • Terminate and re-run the workflow.
    • If the issue still persist, contact Nintex Support with the details of the email address so we can check in the log files. 
    ADDITIONAL INFORMATION
    • The issue is intermittent and only occurs in the period of time. 
    • The root cause is the email address has been soft blacklist by Nintex Mail Server provider because previously it tried to send an email with attachment greater than 20MB. 
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