Error - '5.5.2 need RCPT command' when task is not sending email

This error is being sent back by the email server. This is likely due to an email address being missing in the data or the email address being incorrectly formatted. The SMTP step will be using an email address from the dataset as the Send To address and this is likely to be NULL in the dataset.
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To resolve this issue Support will need to run some scripts on the database. Therefore please raise a new case online and reference the title of this article and please include details of the task that is failing.