Error when trying to send emails with Amazon SES from a droplet

When I tried to send emails with Amazon SES from a droplet, I always get this error in the log:, relay=none, delay=592, delays=592/0.07/0/0, dsn=4.4.3, status=deferred (Host or domain name not found. Name service error for type=MX: Host not found, try again)

But when I do it from my EC2 instance, it works fine.

The droplet and the EC2 instance have identical postfix settings. I followed instructions on to the letter.

Any idea? Please advise!

Thanks so much.

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This question was answered by @daltracllc:

I have found a solution that fixed this problem. Here it is:

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