Configuration

disable_vrfy_command

(boolean) Disable the SMTP VRFY command. This isn't usually useful for relays.

True

domain_rewrite_map

(string) A list of domain:newdomain pairs to rewrite. Primarily used for allowing hosts with locally-resolvable domain names to send mail which appears to be from a real domain. Addresses in these domains will be rewritten from user@host.domain to user+host@newdomain.

myhostname

(string) The external hostname by which this mail relay is known. This value must be changed for the charm to be useful.

postfix-relay.example.com.

mynetworks

(string) A comma-separated list of networks for which this relay will allow sending mail.

127.0.0.0/8

relayhost

(string) An upstream mail relay, sometimes called "smart host". Enclose it in square brackets to skip MX lookup.

smtp_auth_password

(string) Password to auth against remote mail server using smtp_auth_username. Requires smtp_auth_username to take effect.

smtp_auth_username

(string) Username to auth against remote mail server. Requires smtp_auth_password to take effect.

smtpd_helo_required

(boolean) Require that a remote SMTP client sends HELO or EHLO before commencing a MAIL transaction.

True

smtpd_recipient_restrictions

(string) Optional restrictions which the Postfix SMTP server applies in the context of a client RCPT TO command.

permit_mynetworks, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_pipelining

ssl_ca

(string) Base64-encoded SSL CA to use with the upstream relay host. If set postfix will assume the upstream host is using TLS and configure itself accordingly.