I have a assignment in school to setup bind9, postfix, spf, dkim and dovecot on the same machine for the address mcduckcorp.duckburg.cali on a Debian 9 OS.
I have managed to setup bind9, postfix and dovecot so that I can send and recieve mail but the dkim setup creates a problem. Whenever I try sending mail I get the error in sudo service opendkim status:
opendkim[1097]: 1EBD854249B: external host www.mcduckcorp.duckburg.cali attempted to send as mcduckcorp.duckburg.cali
also when checking the recieved mail with the mail command I have the following error in the header of the mail:
Authentication-Results: mail.mcduckcorp.duckburg.cali; dkim=permerror (bad message/signature format)
The content of the /etc/opendkim.conf file is:
Syslog yes
UMask 007
Domain mcduckcorp.duckburg.cali
KeyFile /etc/opendkimkeys/private.key
Selector mail
SubDomains yes
Socket inet:12345@localhost
PidFile /var/run/opendkim/opendkim.pid
OversignHeaders From
TrustAnchorFile /usr/share/dns/root.key
UserID opendkim
The file /etc/default/opendkim contains:
RUNDIR=/var/run/opendkim
SOCKET=inet:12345@localhost
USER=opendkim
GROUP=opendkim
PIDFILE=$RUNDIR/$NAME.pid
EXTRAAFTER=
The file /etc/postfix/main.cf contains:
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
readme_directory = no
compatibility_level = 2
smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_relay_restrictions = permit_mynetworks reject_unauth_destination permit_sasl_authenticated check_policy_service unix:private/policy-spf
smtpd_recipient_restrictions = permit_mynetworks reject_unauth_destination permit_sasl_authenticated check_policy_service unix:private/policy-spf
myhostname = mail.mcduckcorp.duckburg.cali
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = mcduckcorp.duckburg.cali
mydestination = $myhostname, mcduckcorp.duckburg.cali, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = 192.168.55.6
inet_protocols = all
relay_domains = mcduckcorp.duckburg.cali
# DKIM
milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:12345
non_smtpd_milters = inet:localhost:12345
# SPF
policy-spf_time_limit = 3600s
The file /etc/postfix/master.cf contains:
pickup unix n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
qmgr unix n - n 300 1 qmgr
tlsmgr unix - - y 1000? 1 tlsmgr
rewrite unix - - y - - trivial-rewrite
bounce unix - - y - 0 bounce
defer unix - - y - 0 bounce
trace unix - - y - 0 bounce
verify unix - - y - 1 verify
flush unix n - y 1000? 0 flush
proxymap unix - - n - - proxymap
proxywrite unix - - n - 1 proxymap
smtp unix - - y - - smtp
relay unix - - y - - smtp
showq unix n - y - - showq
error unix - - y - - error
retry unix - - y - - error
discard unix - - y - - discard
local unix - n n - - local
virtual unix - n n - - virtual
lmtp unix - - y - - lmtp
anvil unix - - y - 1 anvil
scache unix - - y - 1 scache
maildrop unix - n n - - pipe
flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
uucp unix - n n - - pipe
flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
ifmail unix - n n - - pipe
flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
bsmtp unix - n n - - pipe
flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
scalemail-backend unix - n n - 2 pipe
flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
mailman unix - n n - - pipe
flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
${nexthop} ${user}
policy-spf unix - n n - - spawn
user=nobody argv=/usr/bin/policyd-spf
The file /etc/bind/named.conf.local conatins:
zone "cali" {
type master;
file "/etc/bind/zones/cali.db";
};
zone "duckburg.cali" {
type master;
file "/etc/bind/zones/duckburg.cali.db";
};
zone "mcduckcorp.duckburg.cali" {
type master;
file "/etc/bind/zones/mcduckcorp.duckburg.cali.db";
//auto-dnssec maintain;
inline-signing yes;
};
zone "55.168.192.in-addr.arpa" {
type master;
file "/etc/bind/zones/55.168.192.in-addr.arpa.db";
};
and the /etc/bind/named.conf.options file contains:
options {
directory "/var/cache/bind";
forwarders {
192.168.55.5;
};
auth-nxdomain no; # conform to RFC1035
listen-on-v6 { any; };
};
the file /etc/bind/zones/mcduckcorp.duckburg.cali.db contains:
@ IN SOA ns1.mcduckcorp.duckburg.cali. mail.mcduckcorp.duckburg.cali. (
2018101100 ;serial
86400 ;refresh
7200 ;retry
3600000 ;expiration
172800) ;minimum
@ IN NS ns1.mcduckcorp.duckburg.cali.
ns1.mcduckcorp.duckburg.cali. IN A 192.168.55.5
www IN A 192.168.55.5
mail IN A 192.168.55.6
squirrel IN CNAME www
mcduckcorp.duckburg.cali. IN MX 10 mail.mcduckcorp.duckburg.cali.
mail._domainkey IN TXT ( "v=DKIM1; h=sha256; k=rsa; t=y; "
"p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr5UWdHzwwL/gki26JF+y9t/8VUfY9wb2hAwX825D2q4hnIEMFzZSKDyvug7+D19nDp7f1VQ4x2JFvVVVwMwanaB3WHmlsLa9AItFv5yL2i6b1RrXdgFiezJt22K/TNvkjGohxnGsC/7lHIvlkN4Em4Zok/eoquWg294b05I+4vR3TWf2PbxxPgYKR0D9ahtkA632asGAMG0gRh"
"m8Xw2hPSk6LT0QHWdPM0iw20WZJdZflhjsByIj1BWL+L/TetnCOORwfz6A9T/+L0zQUodpJNKyYbnZ6Wxac4n6pnaiO99znUlKuQDuhyDfSbqLqi9it5Rise6FryhL1YBf5USGtwIDAQAB" ) ; ----- DKIM key mail for mcduckcorp.duckburg.cali
mcduckcorp.duckburg.cali. IN TXT "v=spf1 mx ~all"
mcduckcorp.duckburg.cali. IN SPF "v=spf1 mx ~all"
I have searched for the error
dkim=permerror (bad message/signature format)
online but haven't been able to find anything that seems related at the moment..
