smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname, reject_unknown_hostname, permit
smtpd_sender_restrictions = reject_unknown_sender_domain, reject_invalid_hostname, permit
smtpd_client_restrictions = permit_mynetworks, reject_unknown_client
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, reject_unknown_recipient_domain, reject_unverified_recipient
smtpd_etrn_restrictions = permit_mynetworks, reject
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