Hello.
I send mails to badly (but apparently RFC compliant) destination.
MX of destination are:
---------------------------------------------------------
:~ # host -t mx destination.cz
destination.cz mail is handled by 10 cax.destination.cz.
destination.cz mail is handled by 20 cbx.destination.cz.
destination.cz mail is handled by 30 ccx.destination.cz.
destination.cz mail is handled by 40 cdx.destination.cz.
---------------------------------------------------------
Hosts have IPs:
---------------------------------------------------------
:~ # host cax.destination.cz.
cax.destination.cz has address 1.2.3.4
cax.destination.cz has address 5.6.7.8
:~ # host cbx.destination.cz.
cbx.destination.cz has address 11.22.33.44
cbx.destination.cz has address 55.66.77.88
-- etc. -------------------------------------------------
After connect to 1.2.3.4, SMTP server reply "421 Service temporarily not
available" (before HELO/EHLO) and immediately close connection. But
Postfix don't try 5.6.7.8 or 11.22.33.44 or 55.66.77.88 and the mail stay
in a queue as deferred. Next delivery attempt (after about 20 minutes) is
again to 1.2.3.4.
I think Postfix should try delivery to 5.6.7.8 etc. according to
"http://www.postfix.org/postconf.5.html#smtp_skip_4xx_greeting";. Why not?
=========================================================
My configuration:
Debian 7
Postfix 2.9.6
:~ # postconf -n
address_verify_map = btree:${data_directory}/verify.btree
address_verify_negative_expire_time = 10m
address_verify_negative_refresh_time = 1m
address_verify_poll_delay = 6s
address_verify_positive_expire_time = 10d
address_verify_positive_refresh_time = 7d
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 1m
anvil_status_update_time = 1h
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
delay_warning_time = 24h
dovecot_destination_recipient_limit = 1
inet_protocols = ipv4
mailbox_size_limit = 1073741824
message_size_limit = 20971520
mydestination = $myhostname
myhostname = my.time.cz
mynetworks = 127.0.0.0/8, 7.9.1.9
r_urban = check_sender_access hash:/etc/postfix/urban_send
relay_domains = relay1.cz relay2.cz
relayhost =
smtp_helo_name = $myhostname
smtp_tls_security_level = may
smtpd_client_connection_rate_limit = 3000
smtpd_client_event_limit_exceptions =
smtpd_client_message_rate_limit = 3000
smtpd_client_recipient_rate_limit = 6000
smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated,
check_sender_access hash:/etc/postfix/access_send_cz, check_client_access
cidr:/etc/postfix/access_client_whtlst, check_recipient_access
hash:/etc/postfix/access_rcpt, reject_rbl_client bl.spamcop.net,
reject_rbl_client sbl.spamhaus.org, reject_rbl_client xbl.spamhaus.org
smtpd_hard_error_limit = 3
smtpd_helo_required = yes
smtpd_helo_restrictions =
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated,
reject_unauth_destination, reject_unknown_recipient_domain,
reject_unlisted_recipient, reject_unverified_recipient
smtpd_restriction_classes = r_urban
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sender_restrictions = reject_unknown_sender_domain, check_sender_access
hash:/etc/postfix/access_send, check_client_access
cidr:/etc/postfix/access_client_whtlst, check_recipient_access
hash:/etc/postfix/access_rcpt, reject_unverified_sender
smtpd_soft_error_limit = 1
smtpd_tls_cert_file = /etc/postfix/server.pem
smtpd_tls_key_file = $smtpd_tls_cert_file
smtpd_tls_loglevel = 1
smtpd_tls_security_level = may
transport_maps = hash:/etc/postfix/transport
unverified_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual
virtual_mailbox_domains = /etc/postfix/virtual_domains
virtual_mailbox_maps = hash:/etc/postfix/vmailbox
virtual_transport = dovecot
=========================================================
Thank you for your response in advance
--
Michal Kurka - Mysak
sluzby spojene s operacnim systemem Linux
