SuiteCRM email settings always provide authentication error - UCS on AWS EC2 + SUITE CRM

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You can get some extra logging with this

Problem to send a test Email [Performing Task - "One moment please..."]

Have a look at this send() function here there are several commented lines there that you can use to troubleshoot. This will help you see what is actually being sent out to the SMTP server, edit those fields for tests, and get a full SMTP log.