Node mailer gives the rest mail ECONNREFUSED error in server after sending 6 successfull mail always

I am facing a problem related node mailing service. I am trying to send mail by node mailer in windows server. Out 15 mail or 12 mail it always send first 6 mail success fully.For the rest mail i am getting connection refused error.

{ Error: connect ECONNREFUSED 198.57.247.139:465      at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1106:14)    errno: 'ECONNREFUSED',    code: 'ECONNECTION',    syscall: 'connect',    address: '198.57.247.139',    port: 465,    command: 'CONN' }  

I dont understand what is the problem here. It is not happening in my local environment. If you can give me an idea it will be very help full. Thank you

https://stackoverflow.com/questions/66740222/node-mailer-gives-the-rest-mail-econnrefused-error-in-server-after-sending-6-suc March 22, 2021 at 12:07PM