Scott, here is a TechNet article on using telnet to test SMTP. This will determine if the problem is server or app level.
In case you don't have telnet enabled on the servers, here is another TechNet article that shows you how to do that.
Bitbucket Pipelines helps me manage and automate a number of serverless deployments to AWS Lambda and this is how I do it. I'm building Node.js Lambda functions using node-lambda ...
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