I have two separate servers, both running Ubuntu 8.04.
Server 1 has the real domain name of our site, let's refer to it as example.com. Server 2 is a mail server I have setup with postfix/courier. The hostname for this server is mail.example.com.
I've setup iptables on Server 1 to forward all traffic on port 25 to Server 2. I used this script (except I changed the target ip address and the port from 80 to 25).
When I send an email to user@mail.example.com it works. However, when I try to send an email to user@example.com from gmail, I get this error:
550 550 #5.1.0 Address rejected user@example.com (state 14)
/var/log/mail.log shows no new lines when this happens.
What is strange is that it works with telnet from my local machine. For example:
$ telnet example.com 25 220 VO13421.localdomain SMTP Postfix EHLO example.com 250-VO13421.localdomain 250-PIPELINING 250-SIZE 10240000 250-ETRN 250-STARTTLS 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN MAIL FROM: me@gmail.com 250 2.1.0 Ok RCPT TO: user@example.com 250 2.1.5 Ok data 354 Please start mail input. hello user... how have you been? . 250 Mail queued for delivery. quit 221 Closing connection. Good bye.
/var/log/mail.log shows success (and the email goes to the maildr):
Feb 24 09:47:36 VO13421 postfix/smtpd[2212]: connect from 81.208.68.208.static.dnsptr.net[208.68.xxx.xxx] Feb 24 09:48:01 VO13421 postfix/smtpd[2212]: warning: restriction `smtpd_data_restrictions' after `permit' is ignored Feb 24 09:48:01 VO13421 postfix/smtpd[2212]: 65C68120321: client=81.208.68.208.static.dnsptr.net[208.68.xxx.xxx] Feb 24 09:48:29 VO13421 postfix/smtpd[2212]: warning: restriction `smtpd_data_restrictions' after `permit' is ignored Feb 24 09:48:29 VO13421 postfix/smtpd[2212]: 6BDFA120321: client=81.208.68.208.static.dnsptr.net[208.68.xxx.xxx] Feb 24 09:48:29 VO13421 postfix/cleanup[2216]: 6BDFA120321: message-id= Feb 24 09:48:29 VO13421 postfix/qmgr[2042]: 6BDFA120321: from=, size=395, nrcpt=1 (queue active) Feb 24 09:48:29 VO13421 postfix/virtual[2217]: 6BDFA120321: to=, relay=virtual, delay=0.28, delays=0.25/0.02/0/0.01, dsn=2.0.0, status=sent (delivered to maildir) Feb 24 09:48:29 VO13421 postfix/qmgr[2042]: 6BDFA120321: removed Feb 24 09:48:30 VO13421 postfix/smtpd[2212]: disconnect from 81.208.68.208.static.dnsptr.net[208.68.xxx.xxx]
iptables -L -n -v --line on example.com yields the following. Anyone know an iptables command to see the port forwarding? Also, it seems to accept all traffic, that's probably bad right? ;]
num pkts bytes target prot opt in out source destination 1 14041 1023K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) num pkts bytes target prot opt in out source destination 1 338 20722 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 Chain OUTPUT (policy ACCEPT 419K packets, 425M bytes) num pkts bytes target prot opt in out source destination 1 13711 2824K ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0
postconf -n results in:
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
append_dot_mydomain = no
biff = no
config_directory = /etc/postfix
delay_warning_time = 4h
disable_vrfy_command = yes
inet_interfaces = all
local_recipient_maps =
mailbox_size_limit = 0
masquerade_domains = mail.example.com mail1.example.com
masquerade_exceptions = root
maximal_backoff_time = 8000s
maximal_queue_lifetime = 7d
minimal_backoff_time = 1000s
mydestination =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mynetworks_style = host
myorigin = example.com
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_helo_timeout = 60s
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname SMTP $mail_name
smtpd_client_restrictions = reject_rbl_client sbl.spamhaus.org, reject_rbl_client blackholes.easynet.nl, reject_rbl_client dnsbl.njabl.org
smtpd_delay_reject = yes
smtpd_hard_error_limit = 12
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, warn_if_reject reject_non_fqdn_hostname, reject_invalid_hostname, permit
smtpd_recipient_limit = 16
smtpd_recipient_restrictions = reject_unauth_pipelining, permit_mynetworks, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination, permit smtpd_data_restrictions = reject_unauth_pipelining
smtpd_sender_restrictions = permit_mynetworks, warn_if_reject reject_non_fqdn_sender, reject_unknown_sender_domain, reject_unauth_pipelining, permit
smtpd_soft_error_limit = 3
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
unknown_local_recipient_reject_code = 450
virtual_alias_maps = mysql:/etc/postfix/mysql_alias.cf
virtual_gid_maps = mysql:/etc/postfix/mysql_gid.cf
virtual_mailbox_base = /var/spool/mail/virtual
virtual_mailbox_domains = mysql:/etc/postfix/mysql_domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql_mailbox.cf
virtual_uid_maps = mysql:/etc/postfix/mysql_uid.cf
Best Answer
550 550 #5.1.0 Address rejected user@example.com (state 14)is not a postfix message, which would explain the "/var/log/mail.log shows no new lines when this happens."; perhaps you're not connecting where you think you are.Also, depending on the setting of parent_domain_matches_subdomains, *.example.com will match "example.com" wherever it is configured in postfix.
While
user@example.com | user@example.comis a bit weird, we need to see the contents of the virtual_alias_domains and virtual_mailbox_* tables as well.