/etc/postfix/main.cf:
compatibility_level=2
myhostname = <hostname.domain.tld>
smtpd_banner = $myhostname ESMTP
mynetworks = <CIDR networks separated by spaces> 127.0.0.0/24
maximal_queue_lifetime = 10d
relay_domains = hash:/etc/postfix/relay_domains
transport_maps = hash:/etc/postfix/transport_maps
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination,
check_recipient_access hash:/etc/postfix/relay_recipients, reject
/etc/postfix/relay_domains:
firstdomain.tld OK
.
.
.
lastdomain.tld OK
/etc/postfix/transport_maps:
firstdomain.tld <protocol>:<primary MX hostname>:<primary MX TCP port>
.
.
.
lastdomain.tld <protocol>:<primary MX hostname>:<primary MX TCP port>
/etc/postfix/relay_recipients:
firstu...@domain.tld OK
.
.
.
lastu...@domain.tld OK
run postmap <file> on relay_domains, relay_recipients, transport_maps
restart postfix.
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