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Come posso risolvere l'errore "SMTP server requires a secure connection or the client is not authenticated. The server response was: Authentication required" durante l'invio di una email tramite SES?

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Hello,
* For my aws-SES, the [nslookup email-smtp.eu-central-1.amazonaws.com] give me 2 different IPs.

* When I test the SES connection: [openssl s_client -crlf -quiet -starttls smtp -connect email-smtp.eu-central-1.amazonaws.com:587]
from some EC2, it times out.
* But testing with the IP, only one of the 2 times out: [openssl s_client -crlf -quiet -starttls smtp -connect 40.15.XX.XX:587]
On some machine, and from my PC, no times out with:  [openssl s_client -crlf -quiet -starttls smtp -connect email-smtp.eu-central-1.amazonaws.com:587].
Any idea is welcome, thanks folks.

DNS resolution for aws-SES

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