Postfix sending to A not MX
David
david at daku.org
Sat Feb 26 00:46:28 UTC 2022
Folks
I'm running Ubuntu server 20.04.3. I find that Postfix is trying to
send mail to the destination 'a' record and obviously failing. The
'dig mx' command shows actual MX values for sonic.net.
Can you advise?
The case in question is sending mail to me at my ISP from a Ubuntu
server located outside that ISP. The file /var/log/mail.log shows:
(I have obscured real user and domain names, user 'quser', and domain 'qdomain'
The destination of the email is also obscured, and is 'qtarget').
Feb 25 17:12:59 qserver postfix/postfix-script[564854]: starting the
Postfix mail system
Feb 25 17:12:59 qserver postfix/master[564856]: daemon started --
version 3.4.13, configuration /etc/postfix
Feb 25 17:13:36 qserver postfix/pickup[564857]: 3F8F6300DB8: uid=1000
from=<quser>
Feb 25 17:13:36 qserver postfix/cleanup[564944]: 3F8F6300DB8:
message-id=<20220226001336.3F8F6300DB8 at qserver.quser.org>
Feb 25 17:13:36 qserver postfix/qmgr[564858]: 3F8F6300DB8:
from=<quser at quser.org>, size=372, nrcpt=1 (queue active)
Feb 25 17:14:06 qserver postfix/smtp[564948]: connect to
sonic.net[209.204.190.64]:25: Connection timed out
Feb 25 17:14:06 qserver postfix/smtp[564948]: 3F8F6300DB8:
to=<qtarget at sonic.net>, relay=none, delay=30, delays=0.02/0.02/30/0,
dsn=4.4.1, status=deferred (connect to sonic.net[209.204.190.64]:25:
Connection timed out)
Feb 25 17:15:11 qserver postfix/pickup[564857]: 552E5300E01: uid=0
from=<root at qserver>
Feb 25 17:15:11 qserver postfix/cleanup[564944]: 552E5300E01:
message-id=<20220226001511.552E5300E01 at qserver.quser.org>
Feb 25 17:15:11 qserver postfix/qmgr[564858]: 552E5300E01:
from=<root at qserver>, size=3132, nrcpt=1 (queue active)
Feb 25 17:15:11 qserver postfix/local[565301]: 552E5300E01:
to=<quser at localhost>, orig_to=<alert at quser.org>, relay=local,
delay=0.02, delays=0.01/0.01/0/0.01, dsn=2.0.0, status=sent
(delivered to command: /usr/bin/procmail -a "$EXTENSION")
Feb 25 17:15:11 qserver postfix/qmgr[564858]: 552E5300E01: removed
Feb 25 17:15:11 qserver postfix/postfix-script[565315]: stopping the
Postfix mail system
Feb 25 17:15:11 qserver postfix/master[564856]: terminating on signal 15
Feb 25 17:15:12 qserver postfix/postfix-script[565946]: warning:
unable to create missing queue directories
Feb 25 17:15:12 qserver postfix/postfix-script[565966]: warning:
symlink leaves directory: /etc/postfix/./makedefs.out
Feb 25 17:15:12 qserver postfix/postfix-script[566139]: starting the
Postfix mail system
Feb 25 17:15:12 qserver postfix/master[566141]: daemon started --
version 3.4.13, configuration /etc/postfix
Feb 25 17:15:13 qserver dovecot: master: Warning: Killed with signal
15 (by pid=566149 uid=0 code=kill)
Feb 25 17:15:14 qserver dovecot: master: Dovecot v2.3.7.2 (3c910f64b)
starting up for imap, pop3, lmtp (core dumps disabled)
Feb 25 17:20:12 qserver postfix/qmgr[566143]: 3F8F6300DB8:
from=<quser at quser.org>, size=372, nrcpt=1 (queue active)
Feb 25 17:20:12 qserver postfix/qmgr[566143]: 17C3B3010BF:
from=<quser at quser.org>, size=368, nrcpt=1 (queue active)
Feb 25 17:20:42 qserver postfix/smtp[567014]: connect to
sonic.net[209.204.190.64]:25: Connection timed out
Feb 25 17:20:42 qserver postfix/smtp[567010]: connect to
sonic.net[209.204.190.64]:25: Connection timed out
Feb 25 17:20:42 qserver postfix/smtp[567014]: 17C3B3010BF:
to=<qtarget at sonic.net>, relay=none, delay=1129,
delays=1099/0.02/30/0, dsn=4.4.1, status=deferred (connect to
sonic.net[209.204.190.64]:25: Connection timed out)
Feb 25 17:20:42 qserver postfix/smtp[567010]: 3F8F6300DB8:
to=<qtarget at sonic.net>, relay=none, delay=426, delays=396/0.03/30/0,
dsn=4.4.1, status=deferred (connect to sonic.net[209.204.190.64]:25:
Connection timed out)
My /etc/postfix/main.cf is enclosed below;
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
command_directory = /usr/sbin
compatibility_level = 2
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
ddd $daemon_directory/$process_name $process_id & sleep 5
default_privs = nobody
disable_dns_lookups = yes
home_mailbox = Maildir/
inet_interfaces = all
inet_protocols = ipv4
local_recipient_maps = proxy:unix:passwd.byname $alias_maps
mail_owner = postfix
mailbox_command = /usr/bin/procmail -a "$EXTENSION"
mailbox_size_limit = 0
mua_client_restrictions = permit_sasl_authenticated, reject
mua_helo_restrictions = permit_mynetworks,
reject_non_fqdn_hostname, reject_invalid_hostname, permit
mua_sender_restrictions = permit_sasl_authenticated, reject
mydestination = localhost.$mydomain localhost $mydomain
mydomain = quser.org
myhostname = qserver.quser.org
mynetworks = 127.0.0.0/8 192.168.0.0/16
10.0.0.0/8 172.16.0.0/12
myorigin = $mydomain
queue_directory = /var/spool/postfix
readme_directory = no
recipient_delimiter = +
relayhost =
smtp_tls_CApath = /etc/ssl/certs
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_relay_restrictions = permit_mynetworks
permit_sasl_authenticated defer_unauth_destination
smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key
smtpd_tls_security_level = may
unknown_local_recipient_reject_code = 550
virtual_alias_domains = qserver.quser.org
virtual_alias_maps = hash:/etc/postfix/virtualusers
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