I use node-red-contrib-aws to push data to Amazon AWS service. In particular I use the Simple Notification Service to send alarms out. Node-Red sends a message to AWS SNS, which then makes AWS responsible for sending e-mails and/or SMS messages to the subscribers. I also have some subroutines to send messages to AWS from my PAC Control strategy, but I have not used any of it in a production project yet.
This allows me to avoid the headache of keeping up with SMTP security restrictions - it sucks when your alarms don’t make it to the end user - am I right?