NOTE: Before doing anything, make sure you have set the full qualified domain name of your server (AWS will not do this for you)

• hostnamectl set-hostname <name>.<domain>

Install the tools you will need

• apt install postfix mailutils
• cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
• systemctl enable postfix
• systemctl start postfix
• cd /etc/postfix
• edit main.cf and change the parameter my-origin and change it to the following: my-origin = <domain>
• Add the following to the end

myhostname=<host>.<domain>
mydomain=<domain>
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:SMTP_Injection:<hash string>
relayhost = [smtp.sparkpostmail.com]:587
smtp_sasl_security_options = noanonymous
smtp_tls_security_level = encrypt
header_size_limit = 4096000

Go to the Sparkpost Console

• Add a domain
• Enter the information and note the DKIM record
• Add that record to your DNS (on AWS/Route 53 add as a TXT)
• In Sparkpost, verify that the DKIM record is correct

From your host

• echo “Test mail from New Ubuntu Server” | mail -s “Test Email” <email address>