@Luwi  I agree that it is likely not some kinda of quota and rather a connection interruption and since the default timeout in the smtp client is indefinite, the PutEmail processor will never timeout the bad connection and then execute a new thread to establish a new connection.  The Jira (https://issues.apache.org/jira/browse/NIFI-9758) I mentioned in previous response provides the new capability to set smtp timeouts to resolve this issue.  You'll need to upgrade to Apache NiFi 1.17 or newer to get this processor improvement.   If you found that the provided solution(s) assisted you with your query, please take a moment to login and click Accept as Solution below each response that helped. Thank you, Matt ... View more

ok, just figured it out. In the "content type" property of PutEmail, there must be charset defined as well, just like this: text/html;charset=utf-8 ... View more

You will need to get both the year and the month of the original date (because of the leap year considerations). In terms of how to accomplish this in NiFi one way is to use ExecuteScript processor and Python's calendar library with the function calendar.monthrange(year,  month) that returns the last day of month as the second argument.  ... View more