Hi @Jaimin7, I am not quite sure how your SMTP Server is configured, but everywhere I have implemented the PutEmail processors, I needed 5 mandatory properties: 1) SMTP Hostname 2) SMTP Port 3) SMTP Username (even though in NiFi it is not a mandatory field, it was a mandatory field for the STMP to allow the connection) 4) SMTP Password (even though in NiFi it is not a mandatory field, it was a mandatory field for the STMP to allow the connection) 5) From.   Having all these fields configured, I was able to send email from NiFi without any restrictions. Of course, I made sure that the firewall connection between NiFi and the SMTP Server is allowing such connections 🙂 ... View more

Ahh my confusion, it is hard to assume without a lot more detail.   Reference: https://nifi.apache.org/docs/nifi-docs/html/expression-language-guide.html#gt   ${fileSize:gt( 1024 )}  You need to use the expression "gt( some value )" against a parameter or variable.  In the case above, "file size greater than 1024". ... View more