Always use Ireland for SES SMTP server.
Always use Ireland for SES SMTP server.

We were interpolating the AWS region into the hostname being used here,
but SES is only available in 3 regions globally[1] - London isn't one of
them.  email-smtp.eu-west-2.amazonaws.com does not resolve.

This causes the password reset flow to fail with a 500 error because UAA
is unable to mail the reset link to the user.

We address this by hardcoding eu-west-1 (Ireland) as that's the closest
available region for all our deployments

[1] https://docs.aws.amazon.com/ses/latest/DeveloperGuide/regions.html

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