/media/sda-magnetic/david/Extern-Magnetic-2022-06-29/Extern01/Dokumente-11-2021-07-05/informatik-math/informatik2/bash-programming/lex-yacc-bash-etc/mancf-bsp000012.txt

# client
# sender
# recipient
# hostname

smtpd_client_restrictions
smtpd_sender_restrictions
smtpd_recipient_restrictions
smptd_helo_restrictions
smtpd_data_restrictions
smtpd_end_of_data_restrictions
smtpd_etrn_restrictions

permit_my_networks

# unknown

reject_unknown_client
reject_unknown_client_hostname
reject_unknown_reverse_client_hostname
reject_unknown_helo_hostname
reject_unknown_sender_domain
reject_unknown_recipient_domain
reject_unknown_hostname

reject_non_fqdn_sender
reject_non_fqdn_client
reject_non_fqdn_hostname

check_policy_servce

reject_invalid_hostname