Email succeeds on one server but fails on other

We are using Docker and one of my flow uses node-red-node-email node to send out an email after a certain action. The email node works good in our dev environment but does not work in production (Same image is pushed to couple other servers that serve as production)


Error: Invalid greeting from server:
421 4.3.2 Service not available: 421 4.3.2 Service not available

Using smtp on port 25 without SSL.


Please note that this was working earlier and stopped working all of a sudden. I am absolutely clueless. Any inputs? @knolleary

SMTP error 421 is not a specified error, it's more an randomly used error.
Check with your provider what this error means.

@edge11 It was indeed an internal issue. The service had been deactivated. Thanks.

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