AWS SES

Amazon SES (Simple Email Service) provides a simple way for cloud based applications to send and receive email.

Configuration via ENV

Configure a relay host in DMS to forward all your mail through AWS SES:

RELAY_HOST should match your AWS SES region.
RELAY_PORT should be set to one of the supported AWS SES SMTP ports (eg: 587 for STARTTLS).
RELAY_USER and RELAY_PASSWORD should be set to your Amazon SES SMTP credentials.

RELAY_HOST=email-smtp.us-west-2.amazonaws.com
RELAY_PORT=587
# Alternative to RELAY_HOST + RELAY_PORT which is compatible with LDAP:
DEFAULT_RELAY_HOST=[email-smtp.us-west-2.amazonaws.com]:587

RELAY_USER=aws-user
RELAY_PASSWORD=secret

Tip

If you have set up AWS Easy DKIM, you can safely skip setting up DKIM as AWS SES will take care of signing your outbound mail.

Verify the relay host is configured correctly

To verify proper operation, send an email to some external account of yours and inspect the mail headers.

You will also see the connection to SES in the mail logs:

postfix/smtp[692]: Trusted TLS connection established to email-smtp.us-west-1.amazonaws.com[107.20.142.169]:25:
  TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
postfix/smtp[692]: 8C82A7E7: to=<someone@example.com>, relay=email-smtp.us-west-1.amazonaws.com[107.20.142.169]:25,
  delay=0.35, delays=0/0.02/0.13/0.2, dsn=2.0.0, status=sent (250 Ok 01000154dc729264-93fdd7ea-f039-43d6-91ed-653e8547867c-000000)