Recently I configured my mail server which uses Postfix and Courier. Everything works except for the authentication when sending mail via my Postfix server(running on port 587) which has StartTLS enabled and uses SASLAuthentication with virtual domains and maps.
Logs
When I try to connect with my e-mail client to send a message I get the following messages to show up in /var/log/mail.log:
postfix/smtpd[5108]: connect from ip domain.com[xxx.xxx.xxx.xxx]
postfix/smtpd[5108]: Anonymous TLS connection established from domain.com[xxx.xxx.xxx.xxx]: TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)
postfix/smtpd[5108]: warning: domain.com[xxx.xxx.xxx.xxx]: SASL CRAM-MD5 authentication failed: authentication failure
postfix/smtpd[5108]: disconnect from domain.com[xxx.xxx.xxx.xxx]
Configuration
/etc/postfix/main.cf:
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
append_dot_mydomain = no
readme_directory = no
smtpd_use_tls = yes
smtpd_tls_received_header = yes
smtpd_tls_cert_file = /etc/ssl/private/domain_com.crt
smtpd_tls_key_file = /etc/ssl/private/domain.key
smtpd_tls_CAfile = /etc/ssl/private/certificates.ca-bundle
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
broken_sasl_auth_clients = yes
smtpd_sasl_path = smtpd
smtpd_tls_session_cache_timeout = 3600s
smtpd_tls_loglevel = 1
tls_random_source = dev:/dev/urandom
myhostname = domain.com
virtual_mailbox_domains = /etc/postfix/virtual_domains
virtual_mailbox_base = /home/vmail
virtual_mailbox_maps = hash:/etc/postfix/virtual_maps
virtual_minimum_uid = 100
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
myorigin = domain.com
mydestination = domain.com, localhost.com, , localhost
reject_unknown_recipient_domain,
reject_unauth_destination,
reject_rbl_client sbl.spamhaus.org,
permit
smtpd_helo_restrictions = reject_invalid_helo_hostname,
reject_non_fqdn_helo_hostname,
reject_unknown_helo_hostname
smtpd_client_restrictions = reject_rbl_client dnsbl.sorbs.net
smtpd_sasl_local_domain =
smtpd_sasl_authenticated_header = yes
smtp_use_tls = yes
smtp_tls_note_starttls_offer = yes
home_mailbox = Maildir/
smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_security_options = noanonymous noplaintext
smtpd_recipient_restrictions = reject_unauth_destination permit_sasl_authenticated
smtpd_tls_security_level = encrypt
smtpd_tls_loglevel = 1
smtpd_tls_auth_only = no
/etc/default/saslauthd:
START=yes
PWDIR="/var/spool/postfix/var/run/saslauthd"
PARAMS="-m ${PWDIR}"
PIDFILE="${PWDIR}/saslauthd.pid"
DESC="SASL Authentication Daemon"
NAME="saslauthd"
MECHANISMS="rimap"
MECH_OPTIONS="127.0.0.1"
THREADS=5
OPTIONS="-c -r -m /var/spool/postfix/var/run/saslauthd"
Directories
ls /etc/postfix/sasl/:
(empty)
ls /etc/postfix/:
dynamicmaps.cf main.cf master.cf postfix-files postfix-script post-install sasl smtpd.conf virtual.db virtual_domains virtual_maps virtual_maps.db
ls /etc/courier/:
authdaemonrc imapd imapd.cnf imapd-ssl shared userdb userdb.dat userdb.lock userdbshadow.dat
Notes
- The whole authentication with userdb for the courier server via imaps works perfectly fine. So there has to be some problem with my postfix configuration.
Questions
- How can I fix my configuration, to make the authentication function.
- Is it possible to debug the SASLAuthentication, it only tells me if it's successful or not, but not that for example the username can't be found.
If you need any more information, please don't hesitate to ask. If you notice something weird about my configuration or if you have any suggestions for improvement also please let me know. Thank you very much. Any help is greatly appreciate it.
