I am trying to work out what parameters to add to
/smtpd_relay_restrictions, /both in main.cf and master.cf.
1. We do not allow relaying by any means!
2. In-house users must be registered, use our domains and port 587
(submission) to send.
I use /check_sender_access/ with a table in the form "example.com
permit_sasl_authenticated, reject" to enforce these rules (thanks
to a Sebastian Nielsen for the idea) in the submission section of
master.cf.
3. We accept mail from the rest of the world on port 25 (smtp).
Currently in main.cf I have reject_unauth_destination as the only
parameter of smtpd_relay_restrictions.
In master.cf I have had to add permit_sasl_authenticated, reject to
the smtpd_relay_restrictions, this seems to be odd as I am using a
more "restrictive" version of this in recipient_ restrictions. If I
leave it blank/unset all mail on 587 gets rejected with "*/An error
occurred while sending mail. The mail server responded: /**/5.7.1
<j...@klam.ca>: Recipient address rejected: Access denied. /**/Please
check the message recipient "j...@klam.ca" and try again.
/*What would be a*//*/better/ set of parameter for both main.cf and
master.cf.
=======main.cf========*//
*alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
bounce_size_limit = 65536
compatibility_level = 2
content_filter = smtp-amavis:[127.0.0.1]:10024
default_process_limit = 20
delay_warning_time = 12h
disable_vrfy_command = yes
header_size_limit = 32768
home_mailbox = Maildir/
html_directory = /usr/share/doc/postfix/html
inet_protocols = ipv4, ipv6
mailbox_transport = lmtp:unix:private/dovecot-lmtp
message_size_limit = 32768000
mime_header_checks = pcre:/etc/postfix/maps/mime_header_checks.pcre
mydestination = localhost, localhost.localdomain, localdomain
mydomain = klam.ca
myhostname = smtp.$mydomain
mynetworks = 127.0.0.0/8, [::1]/128
myorigin = $mydomain
postscreen_access_list = permit_mynetworks
postscreen_bare_newline_action = enforce
postscreen_bare_newline_enable = yes
postscreen_blacklist_action = drop
postscreen_disable_vrfy_command = $disable_vrfy_command
postscreen_dnsbl_action = enforce
postscreen_dnsbl_sites = zen.spamhaus.org*3 b.barracudacentral.org*2
bl.spameatingmonkey.net*2 bl.ipv6.spameatingmonkey.net*2
bl.spamcop.net
dnsbl.sorbs.net psbl.surriel.com bl.mailspike.net swl.spamhaus.org*-4
list.dnswl.org=127.[0..255].[0..255].0*-2
list.dnswl.org=127.[0..255].[0..255].1*-3
list.dnswl.org=127.[0..255].[0..255].[2..255]*-4
postscreen_dnsbl_threshold = 3
postscreen_dnsbl_whitelist_threshold = -1
postscreen_enforce_tls = $smtpd_enforce_tls
postscreen_greet_action = enforce
postscreen_helo_required = yes
postscreen_non_smtp_command_enable = yes
postscreen_pipelining_enable = yes
postscreen_use_tls = $smtpd_use_tls
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
relocated_maps = hash:/etc/postfix/maps/relocated
smtp_dns_support_level = dnssec
smtp_tls_ciphers = medium
smtp_tls_exclude_ciphers = DES, MD5, RC2, RC4, RC5, IDEA, SRP, PSK, aDSS,
kECDhe, kECDhr, kDHd, kDHr, SEED, LOW, EXPORT
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_security_level = dane
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP
smtpd_client_restrictions = reject_unknown_reverse_client_hostname,
reject_rbl_client zen.spamhaus.org, reject_rbl_client
b.barracudacentral.org, reject_rbl_client bl.spameatingmonkey.net,
reject_rbl_client bl.ipv6.spameatingmonkey.net, reject_rbl_client
dnsbl.sorbs.net, reject_rbl_client bl.spamcop.net
smtpd_data_restrictions = reject_multi_recipient_bounce,
reject_unauth_pipelining
smtpd_delay_reject = yes
smtpd_error_sleep_time = 5s
smtpd_etrn_restrictions = reject
smtpd_helo_required = yes
smtpd_helo_restrictions = reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname, check_helo_access
pcre:/etc/postfix/maps/helo_checks.pcre
smtpd_recipient_limit = 128
smtpd_recipient_restrictions = reject_non_fqdn_recipient,
reject_unknown_recipient_domain, check_recipient_access
pcre:/etc/postfix/maps/recipient_checks.pcre, check_recipient_access
hash:/etc/postfix/maps/recipient_checks, check_policy_service
inet:127.0.0.1:10023
smtpd_relay_restrictions = reject_unauth_destination
smtpd_sasl_auth_enable = no
smtpd_sender_restrictions = reject_non_fqdn_sender,
reject_unknown_sender_domain, check_sender_access
hash:/etc/postfix/maps/sender_checks
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /root/ssl/certs/$mydomain.mail.pem
smtpd_tls_ciphers = medium
smtpd_tls_exclude_ciphers = $smtp_tls_exclude_ciphers
smtpd_tls_key_file = /root/ssl/private/$mydomain.mail.key
smtpd_tls_mandatory_protocols = $smtp_tls_mandatory_protocols
smtpd_tls_protocols = $smtp_tls_protocols
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
strict_rfc821_envelopes = yes
transport_maps = hash:/etc/postfix/maps/transport
virtual_alias_maps = proxy:pgsql:/etc/postfix/sql/virtual_alias_map.sql,
proxy:pgsql:/etc/postfix/sql/virtual_alias_domain_map.sql
virtual_mailbox_domains =
proxy:pgsql:/etc/postfix/sql/virtual_domain_map.sql
virtual_mailbox_maps =
proxy:pgsql:/etc/postfix/sql/virtual_mailbox_map.sql,
proxy:pgsql:/etc/postfix/sql/virtual_alias_domain_mailbox_map.sql
virtual_transport = lmtp:unix:private/dovecot-lmtp
=======main.cf========*//*
smtp inet n - n - 1 postscreen
smtpd pass - - n - - smtpd
-o cleanup_service_name=pre-cleanup
pickup fifo n - n 60 1 pickup
-o cleanup_service_name=pre-cleanup
submission inet n - n - 30 smtpd
-o content_filter=smtp-amavis:[127.0.0.1]:10026
-o syslog_name=postfix/submission
-o smtpd_tls_security_level=encrypt
-o smtpd_sasl_auth_enable=yes
-o smtpd_sasl_type=dovecot
-o smtpd_sasl_path=private/dovecot-auth
-o smtpd_sasl_local_domain=$mydomain
-o broken_sasl_auth_clients=yes
-o smtpd_sasl_authenticated_header=yes
-o smtpd_client_restrictions=
-o smtpd_data_restrictions=
-o smtpd_etrn_restrictions=reject
-o smtpd_helo_restrictions=
-o {smtpd_recipient_restrictions=check_sender_access
hash:/etc/postfix/maps/submission_access}
-o {smtpd_relay_restrictions=permit_sasl_authenticated, reject}
-o smtpd_sender_restrictions=
-o smtpd_client_connection_count_limit=15
-o smtpd_client_connection_rate_limit=80
-o smtpd_delay_reject=yes
-o cleanup_service_name=pre-cleanup
qmgr fifo n - n 300 1 qmgr
tlsmgr unix - - n 1000? 1 tlsmgr
rewrite unix - - n - - trivial-rewrite
bounce unix - - n - 0 bounce
defer unix - - n - 0 bounce
trace unix - - n - 0 bounce
verify unix - - n - 1 verify
flush unix n - n 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - n - - smtp
-o smtp_bind_address=74.116.186.178
-o smtp_bind_address6=2606:6d00:100:4301::1:200
relay unix - - n - - smtp
showq unix n - n - - showq
error unix - - n - - error
retry unix - - n - - error
discard unix - - n - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - n - - lmtp
anvil unix - - n - 1 anvil
scache unix - - n - 1 scache
smtp-amavis unix - - n - 4 smtp
-o smtp_data_done_timeout=1200
-o smtp_send_xforward_command=yes
-o smtp_tls_note_starttls_offer=no
127.0.0.1:10025 inet n - n - - smtpd
-o content_filter=
-o mynetworks=127.0.0.0/8
-o smtpd_delay_reject=no
-o smtpd_client_restrictions=permit_mynetworks,reject
-o smtpd_helo_restrictions=
-o smtpd_sender_restrictions=
-o smtpd_relay_restrictions=permit_mynetworks,reject
-o smtpd_recipient_restrictions=permit_mynetworks,reject
-o smtpd_data_restrictions=reject_unauth_pipelining
-o smtpd_end_of_data_restrictions=
-o smtpd_restriction_classes=
-o smtpd_error_sleep_time=0
-o smtpd_soft_error_limit=1001
-o smtpd_hard_error_limit=1000
-o smtpd_client_connection_count_limit=0
-o smtpd_client_connection_rate_limit=0
-o local_header_rewrite_clients=
-o local_recipient_maps=
-o
receive_override_options=no_header_body_checks,no_unknown_recipient_checks,no_milters
-o smtpd_tls_security_level=none
-o local_recipient_maps=
-o relay_recipient_maps=
pre-cleanup unix n - n - 0 cleanup
-o virtual_alias_maps=
cleanup unix n - n - 0 cleanup
-o mime_header_checks=
-o nested_header_checks=
-o header_checks=
-o body_checks=
dnsblog unix - - n - 0 dnsblog
tlsproxy unix - - n - 0 tlsproxy
