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Old 21st February 2011, 19:34
mathieu_ mathieu_ is offline
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Exclamation Authentification problem with Postfix


I'm know to postfix, and I am experimenting some problems trying to configure a SMTP relay on my server using Postfix.

I am using Ubuntu 10.04 and I have installed sasl and postfix, using the tutorial here :
I use my ISP (1and1) to send the mail. When I try to send one using sendmail, I get the following error (using postqueue) :

(SASL authentication failed; server auth.smtp.1and1.fr[] said: 535 Authentication failure)

The logs in /var/log/mail.log shows a problem with the certificate verification, and I have no clue where this certificate is coming from, since I have created one (as specified in the tutorial)

Feb 21 17:59:46 scarlatti postfix/master[12295]: terminating on signal 15
Feb 21 17:59:47 scarlatti postfix/master[12531]: daemon started -- version 2.7.0, configuration /etc/postfix
Feb 21 18:01:38 scarlatti postfix/master[1279]: daemon started -- version 2.7.0, configuration /etc/postfix
Feb 21 18:04:00 scarlatti postfix/pickup[1320]: 7C1F385624: uid=1000 from=<xxxx>
Feb 21 18:04:00 scarlatti postfix/cleanup[1659]: 7C1F385624: message-id=<20110221170400.7C1F385624@xxxx>
Feb 21 18:04:00 scarlatti postfix/qmgr[1321]: 7C1F385624: from=<xxxx@xxxx>, size=312, nrcpt=1 (queue active)
Feb 21 18:04:01 scarlatti postfix/smtp[1662]: certificate verification failed for auth.smtp.1and1.fr[]:587: untrusted issuer /C=ZA/ST=Western Cape/L=Cape Town/O=Thawte Consulting cc/OU=Certification Services Division/CN=Thawte Premium Server CA/emailAddress=premium-server@thawte.com
Feb 21 18:04:01 scarlatti postfix/smtp[1662]: 7C1F385624: SASL authentication failed; server auth.smtp.1and1.fr[] said: 535 Authentication failure

Here is my main.cf :

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

# Debian specific: Specifying a file name will cause the first
# line of that file to be used as the name. The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
biff = no

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

readme_directory = no

# TLS parameters
smtpd_tls_key_file = /etc/ssl/private/smtpd.key
smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt
smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options =

smtpd_sasl_local_domain =
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject _unauth_destination

smtp_tls_security_level = may
smtpd_tls_security_level = may
smtpd_tls_auth_only = no
smtp_tls_note_starttls_offer = yes
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.
myhostname = xxxx
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = xxxx, xxxx, localhost.localdomain, localhost
relayhost = [auth.smtp.1and1.fr]:587
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = all
mynetworks =
home_mailbox = Maildir/

Thanks for your help !
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Old 22nd February 2011, 16:10
falko falko is offline
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Can you try this guide? http://www.howtoforge.com/postfix_re...her_mailserver
Download the ISPConfig 3 Manual! | Check out the ISPConfig 3 Billing Module!

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Old 23rd February 2011, 09:31
mathieu_ mathieu_ is offline
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Hi Falko,

Thanks four your message and pointed me this tutorial. I have remove my previous installation (including directories /etc/postfix and /var/spool/postfix) and installed everything from scratch, using :

To install postfix :

And then to configure it :

And it worked fine from the first mail.

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