Using SparkPost with Postfix
Last updated February 2020
To use SparkPost as an SMTP relay for Postfix, create an API key with the 'Send via SMTP' permission enabled, then 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!
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