Quote:
Originally Posted by GrandeRevenueMark
With a serious SMTP service like SparkPost you can check is messages has been sent and then opened.
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It's good that you use something like that, but most NATS programs don't use such paid solutions for these emails I believe.
Also, you could still think of some possibilities when that doesn't help. I could think of some right away:
1. DNS resolving on the NATS server broken, so SMTP host cannot be resolved
2. NATS server firewall issue, blocking the connections to the SMTP server
3. Intermediary routing issue, so the NATS server cannot connect the SMTP server
Noone can think of all possible issues ahead of time, the only way to make sure something works is to test frequently. :-)