email configuration

Tick on the checkbox "When the node is completed, delete previous completed instances". That way, when the node is re executed, the previous instances won't be occupying memory. Otherwise, you can loop the send email smart service to send emails to a batch of 100 users from the group at a time. In this way you donot need to use MNI. and only one instance would do the work.

Hi Srinivas,
No need to use MNI. Put your email smart service in separate asynchronously sub-process, use a count script task up to 1000 and loop back to email smart service, once 1000 count reach end the process. Thanks.

Hi Srinivas,
You can send all the emails in one instance, though sending too many can break the node. I'm not sure the exact number where it breaks but I have sent a few hundred in one instance without any issues. In the end I set the batch size to 100 myself.

Emails sent to that many recipients should probably be BCCed, so what is the issue with using multiple instances?

The best way to solve it! Thanks evans0001 . I operate in the same manner always.