Using SparkPost with Postfix

June 19, 2017 Contributors

To use SparkPost as an SMTP relay for Postfix, create an API key with the ‘Send via SMTP’ permission enabled, thenĀ enter the following into your Postfix config file (typically main.cf):

smtp_sasl_auth_enable = yes 
smtp_sasl_password_maps = static:SMTP_Injection:<your API key>
relayhost = [smtp.sparkpostmail.com]:587
smtp_sasl_security_options = noanonymous 
smtp_tls_security_level = encrypt
header_size_limit = 4096000

Once you’ve modified your config file per the above, restart your Postfix server and you should be good to go!