We created new SMTP credentials in AWS SES. I tried to update the SMTP Mail Server username and password when I tested connection I got a 535 Authentication error.
We are currently on v8.13.3 of Jira and using port 587 also TLS is checked.
Take a look at this post which has the same issue and was able to resolve it. Link: https://community.atlassian.com/t5/Jira-Software-questions/535-Authentication-Credentials-Invalid-Jira-SES-integration/qaq-p/1493844
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