Simple Email Alert Setup

Working on interfaces, trying to add simple email alert (link below) under "Operations"

https://docs.intersystems.com/healthconnect20231/csp/docbook/DocBook.UI....

if the message is good,  health connect processes ok.

if the message has an ERROR, it held up the message in Queue (keep retrying), then subsequent messages held up in the queue as well to be processed. Because of the message held up in Queue, Operation for TCP connection also turning blue.

Please advice.