I'm next configuring a service to provide outbound smarthosting to a local
server. As with several of my other services, the goal is to use TLS cert
check/auth only, no SASL.
Sending a test message via the local server, log at the smarthost shows message
reject "Recipient address rejected: Access denied",
Jun 10 08:14:52 remote016 postfix/smarthost/smtpd[20272]: connect from
internal.local010.DDDD.com[10.128.1.10]
Jun 10 08:14:52 remote016 postfix/smarthost/smtpd[20272]: Trusted TLS
connection established from internal.local010.DDDD.com[10.128.1.10]: TLSv1.2
with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Jun 10 08:14:52 remote016 postfix/smarthost/smtpd[20272]: NOQUEUE:
reject: RCPT from internal.local010.DDDD.com[10.128.1.10]: 554 5.7.1
<check-a...@verifier.port25.com>: Recipient address rejected: Access denied;
from=<ad...@dddd.com> to=<check-a...@verifier.port25.com> proto=ESMTP
helo=<mail.DDDD.com>
Jun 10 08:14:52 remote016 postfix/smarthost/smtpd[20272]: disconnect
from internal.local010.DDDD.com[10.128.1.10] ehlo=2 starttls=1 mail=1 rcpt=0/1
data=0/1 rset=1 quit=1 commands=6/8
The smarhost config
...
[internal.remote016.DDDD.com]:587 inet n - n - - smtpd
-o permit_tls_clientcerts=yes
-o relay_clientcerts=lmdb:/etc/postfix/smarthost_clientcerts
-o smtpd_client_restrictions=
-o smtpd_data_restrictions=
-o smtpd_end_of_data_restrictions=
-o smtpd_etrn_restrictions=
-o smtpd_helo_restrictions=
-o smtpd_recipient_restrictions=
-o smtpd_relay_restrictions=permit_tls_clientcerts,reject
-o smtpd_sasl_auth_enable=no
-o smtpd_sender_restrictions=
-o smtpd_tls_loglevel=1
-o smtpd_tls_auth_only=yes
-o smtpd_tls_security_level=encrypt
-o smtpd_tls_CAfile=/etc/ssj/mail/DDDD_CA.crt
-o smtpd_tls_CApath=/etc/ssl/certs
-o smtpd_tls_cert_file=/etc/ssj/mail/relay-remote.crt
-o smtpd_tls_ccert_verifydepth=9
-o smtpd_tls_fingerprint_digest=sha1
-o smtpd_tls_key_file=/etc/ssj/mail/relay-remote.key
-o smtpd_tls_mandatory_ciphers=high
-o smtpd_tls_mandatory_protocols=!TLSv1.1,!TLSv1,!SSLv3,!SSLv2
-o smtpd_tls_req_ccert=yes
-o smtpd_tls_wrappermode=no
-o syslog_name=postfix/smarthost
-o amavisdfeed:[127.0.0.1]:40001
where per reading
permit_tls_clientcerts
Allow the remote SMTP client request if the client certificate
fingerprint or certificate public key fingerprint (Postfix 2.9 and later) is
listed in the client certificate table (see relay_clientcerts discussion below).
at server
openssl x509 -pubkey -noout -in /etc/ssh/mail/commercial.crt | openssl
pkey -pubin -outform DER | openssl dgst -sha1 -c
(stdin)=
HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH
and on the smarthost, matching
CLIENT/smarthost_clientcerts
HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH:HH
commercial.crt
I suspect the "Recipient address rejected: Access denied" is due, again and now
in this direction, to incorrect smtpd_relay_restrictions=permit_tls_clientcerts
config ? Perhaps incorrect usage of relay_clientcerts=.
