We will setup a Postfix Relay Servcer which our clients will use to send out mail, the Postfix server will use Amazon’s SES Service to send out mail, which we will configure as a relay host in Postfix.
Setup EC2 Instance to Relay through AWS SES:
Install Postfix and SASL:
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$ apt install postfix mailutils libsasl2-2 sasl2-bin libsasl2-modules ca-certificates -y
$ update-ca-certificates
Section we need to configure in /etc/postfix/main.cf:
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relayhost = [ email-smtp.eu-west-1.amazonaws.com] :587
smtp_use_tls = yes
smtp_sasl_auth_enable = yes
smtp_sasl_security_options =
smtp_sasl_password_maps = hash :/etc/postfix/sasl_passwd
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
Populate SASL Passwd:
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$ cat /etc/postfix/sasl_passwd
[ email-smtp.eu-west-1.amazonaws.com] :587 AKIAABCDEFGHIJKLM:SomeRandomSecretString
Postmap the changes:
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$ postmap /etc/postfix/sasl_passwd
Restart Postfix:
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$ sudo /etc/init.d/postfix restart
Test the Mail Flow:
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$ echo test | mail -r ruan@ruanbekker.com -s 'ses test mail ' ruan@ruanbekker.com && tail -f /var/log/mail.log
Jul 18 11:29:06 ip-10-1-4-250 postfix/smtp[ 5056] : 9FDCB469AA: to = <ruan@ruanbekker.com>, relay = email-smtp.eu-west-1.amazonaws.com[ 52.10.20.30] :587, delay = 0.29, delays = 0.02/0.03/0.12/0.13, dsn = 2.0.0, status = sent ( 250 Ok 0234567d557572f2-76f56252-0a00-4d94-af87-38bd213914d2-000000)
Jul 18 11:29:06 ip-10-1-4-250 postfix/qmgr[ 4392] : 9FDCB469AA: removed
If your output looks more or less like the snippet from above, your mail should be working fine.