Smtp ошибка 250 ошибка авторизации postfix

Feb  4 09:56:16 mail postfix/submission/smtpd[10128]: connect from localhost[127.0.0.1]
Feb  4 09:56:16 mail postfix/submission/smtpd[10128]: disconnect from localhost[127.0.0.1]

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
anvil_rate_time_unit = 60s
bounce_queue_lifetime = 1d
broken_sasl_auth_clients = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 4
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
disable_vrfy_command = yes
dovecot_destination_recipient_limit = 1
html_directory = no
inet_interfaces = all
inet_protocols = ipv4
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
maximal_queue_lifetime = 1d
message_size_limit = 20000000
milter_default_action = accept
milter_protocol = 2
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = exam.org
myhostname = mail.exam.org
mynetworks = 192.168.0.0/16, 127.0.0.0/8
myorigin = $myhostname
newaliases_path = /usr/bin/newaliases.postfix
non_smtpd_milters = $smtpd_milters
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
recipient_bcc_maps = hash:/etc/postfix/recipient_bcc_maps
relay_domains = mysql:/etc/postfix/mysql/relay_domains.cf
sample_directory = /usr/share/doc/postfix-2.10.1/samples
sender_bcc_maps = hash:/etc/postfix/sender_bcc_maps
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_always_send_ehlo = yes
smtp_tls_security_level = may
smtp_tls_session_cache_database = btree:$data_directory/smtp_tls_session_cache
smtpd_banner = $myhostname ESMTP $mail_name
smtpd_client_connection_count_limit = 20
smtpd_client_connection_limit_exceptions = 127.0.0.0/8
smtpd_client_connection_rate_limit = 30
smtpd_client_event_limit_exceptions = 127.0.0.0/8
smtpd_client_message_rate_limit = 30
smtpd_data_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_pipelining, reject_multi_recipient_bounce
smtpd_delay_reject = yes
smtpd_discard_ehlo_keywords = etrn, silent-discard
smtpd_error_sleep_time = 20
smtpd_forbidden_commands = CONNECT GET POST
smtpd_hard_error_limit = 15
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_helo_hostname, reject_invalid_helo_hostname
smtpd_milters = inet:127.0.0.1:8891
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination, reject_multi_recipient_bounce
smtpd_sasl_auth_enable = yes
smtpd_sasl_path = private/dovecot-auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_non_fqdn_sender, reject_unknown_sender_domain
smtpd_soft_error_limit = 10
smtpd_tls_cert_file = /etc/postfix/certs/cert.pem
smtpd_tls_key_file = /etc/postfix/certs/key.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_security_level = may
smtpd_tls_session_cache_timeout = 3600s
soft_bounce = no
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
virtual_alias_maps = mysql:/etc/postfix/mysql/virtual_alias_maps.cf, mysql:/etc/postfix/mysql/virtual_alias_domain_maps.cf
virtual_gid_maps = static:1000
virtual_mailbox_base = /sdb/mail
virtual_mailbox_domains = mysql:/etc/postfix/mysql/virtual_mailbox_domains.cf
virtual_mailbox_maps = mysql:/etc/postfix/mysql/virtual_mailbox_maps.cf
virtual_minimum_uid = 1000
virtual_transport = dovecot
virtual_uid_maps = static:1000

#
# Postfix master process configuration file.  For details on the format
# of the file, see the master(5) manual page (command: "man 5 master").
#
# Do not forget to execute "postfix reload" after editing this file.
#
# ==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       -       smtpd
#smtp      inet  n       -       n       -       1       postscreen
#smtpd     pass  -       -       n       -       -       smtpd
#dnsblog   unix  -       -       n       -       0       dnsblog
#tlsproxy  unix  -       -       n       -       0       tlsproxy
submission inet n       -       n       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_wrappermode=no
  -o smtpd_tls_security_level=encrypt
  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
  -o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
  -o smtpd_relay_restrictions=permit_mynetworks,permit_sasl_authenticated,defer_unauth_destination
  -o milter_macro_daemon_name=ORIGINATING
smtps     inet  n       -       n       -       -       smtpd
  -o syslog_name=postfix/smtps
  -o smtpd_tls_wrappermode=yes
  -o smtpd_sasl_auth_enable=yes
#  -o smtpd_reject_unlisted_recipient=no
#  -o smtpd_client_restrictions=$mua_client_restrictions
#  -o smtpd_helo_restrictions=$mua_helo_restrictions
#  -o smtpd_sender_restrictions=$mua_sender_restrictions
  -o smtpd_recipient_restrictions=permit_mynetworks,permit_sasl_authenticated,reject
  -o smtpd_relay_restrictions=permit_mynetworks,permit_sasl_authenticated,defer_unauth_destination
  -o milter_macro_daemon_name=ORIGINATING
#628       inet  n       -       n       -       -       qmqpd
pickup    unix  n       -       n       60      1       pickup
cleanup   unix  n       -       n       -       0       cleanup
qmgr      unix  n       -       n       300     1       qmgr
#qmgr     unix  n       -       n       300     1       oqmgr
tlsmgr    unix  -       -       n       1000?   1       tlsmgr
rewrite   unix  -       -       n       -       -       trivial-rewrite
bounce    unix  -       -       n       -       0       bounce
defer     unix  -       -       n       -       0       bounce
trace     unix  -       -       n       -       0       bounce
verify    unix  -       -       n       -       1       verify
flush     unix  n       -       n       1000?   0       flush
proxymap  unix  -       -       n       -       -       proxymap
proxywrite unix -       -       n       -       1       proxymap
smtp      unix  -       -       n       -       -       smtp
relay     unix  -       -       n       -       -       smtp
#       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
showq     unix  n       -       n       -       -       showq
error     unix  -       -       n       -       -       error
retry     unix  -       -       n       -       -       error
discard   unix  -       -       n       -       -       discard
local     unix  -       n       n       -       -       local
virtual   unix  -       n       n       -       -       virtual
lmtp      unix  -       -       n       -       -       lmtp
anvil     unix  -       -       n       -       1       anvil
scache    unix  -       -       n       -       1       scache
#
# ====================================================================
# Interfaces to non-Postfix software. Be sure to examine the manual
# pages of the non-Postfix software to find out what options it wants.
#
# Many of the following services use the Postfix pipe(8) delivery
# agent.  See the pipe(8) man page for information about ${recipient}
# and other message envelope options.
# ====================================================================
#
# maildrop. See the Postfix MAILDROP_README file for details.
# Also specify in main.cf: maildrop_destination_recipient_limit=1
#
#maildrop  unix  -       n       n       -       -       pipe
#  flags=DRhu user=vmail argv=/usr/local/bin/maildrop -d ${recipient}
#
# ====================================================================
#
# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
#
# Specify in cyrus.conf:
#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
#
# Specify in main.cf one or more of the following:
#  mailbox_transport = lmtp:inet:localhost
#  virtual_transport = lmtp:inet:localhost
#
# ====================================================================
#
# Cyrus 2.1.5 (Amos Gouaux)
# Also specify in main.cf: cyrus_destination_recipient_limit=1
#
#cyrus     unix  -       n       n       -       -       pipe
#  user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -r ${sender} -m ${extension} ${user}
#
# ====================================================================
#
# Old example of delivery via Cyrus.
#
#old-cyrus unix  -       n       n       -       -       pipe
#  flags=R user=cyrus argv=/usr/lib/cyrus-imapd/deliver -e -m ${extension} ${user}
#
# ====================================================================
#
# See the Postfix UUCP_README file for configuration details.
#
#uucp      unix  -       n       n       -       -       pipe
#  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
#
# ====================================================================
#
# Other external delivery methods.
#
#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/local/sbin/bsmtp -f $sender $nexthop $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}
dovecot unix - n n - - pipe
 flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver -f ${sender} -d ${recipient}

<?php
/* Local configuration for Roundcube Webmail */

// ----------------------------------
// SQL DATABASE
// ----------------------------------
// Database connection string (DSN) for read+write operations
// Format (compatible with PEAR MDB2): db_provider://user:password@host/database
// Currently supported db_providers: mysql, pgsql, sqlite, mssql, sqlsrv, oracle
// For examples see http://pear.php.net/manual/en/package.database.mdb2.intro-dsn.php
// Note: for SQLite use absolute path (Linux): 'sqlite:////full/path/to/sqlite.db?mode=0646'
//       or (Windows): 'sqlite:///C:/full/path/to/sqlite.db'
// Note: Various drivers support various additional arguments for connection,
//       for Mysql: key, cipher, cert, capath, ca, verify_server_cert,
//       for Postgres: application_name, sslmode, sslcert, sslkey, sslrootcert, sslcrl, sslcompression, service.
//       e.g. 'mysql://roundcube:@localhost/roundcubemail?verify_server_cert=false'
$config['db_dsnw'] = 'mysql://roundcube:roundcube654321@localhost/roundcubemail';

// ----------------------------------
// IMAP
// ----------------------------------
// The IMAP host chosen to perform the log-in.
// Leave blank to show a textbox at login, give a list of hosts
// to display a pulldown menu or set one host as string.
// Enter hostname with prefix ssl:// to use Implicit TLS, or use
// prefix tls:// to use STARTTLS.
// Supported replacement variables:
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %s - domain name after the '@' from e-mail address provided at login screen
// For example %n = mail.domain.tld, %t = domain.tld
// WARNING: After hostname change update of mail_host column in users table is
//          required to match old user data records with the new host.
$config['default_host'] = 'localhost';

// ----------------------------------
// SMTP
// ----------------------------------
// SMTP server host (for sending mails).
// Enter hostname with prefix ssl:// to use Implicit TLS, or use
// prefix tls:// to use STARTTLS.
// Supported replacement variables:
// %h - user's IMAP hostname
// %n - hostname ($_SERVER['SERVER_NAME'])
// %t - hostname without the first part
// %d - domain (http hostname $_SERVER['HTTP_HOST'] without the first part)
// %z - IMAP domain (IMAP hostname without the first part)
// For example %n = mail.domain.tld, %t = domain.tld
$config['smtp_server'] = '';

// provide an URL where a user can get support for this Roundcube installation
// PLEASE DO NOT LINK TO THE ROUNDCUBE.NET WEBSITE HERE!
$config['support_url'] = '';

// This key is used for encrypting purposes, like storing of imap password
// in the session. For historical reasons it's called DES_key, but it's used
// with any configured cipher_method (see below).
$config['des_key'] = 's9Pw76uUkLzE8JQCN4S2YmO4';

// ----------------------------------
// PLUGINS
// ----------------------------------
// List of active plugins (in plugins/ directory)
$config['plugins'] = array('acl', 'example_addressbook', 'managesieve', 'password', 'userinfo', 'zipdownload');

// the default locale setting (leave empty for auto-detection)
// RFC1766 formatted language name like en_US, de_DE, de_CH, fr_FR, pt_BR
$config['language'] = 'ru_RU';

[04-Feb-2020 09:56:16 +0300]: <3cc076kv> SMTP Error: Authentication failure: SMTP server does not support authentication (Code: ) in /var/www/html/webmail/program/lib/Roundcube/rcube.php on line 1689 (POST /webmail/?_task=mail&_unlock=loading1580799371477&_framed=1&_lang=ru&_action=send)

CONNECTED(00000003)
depth=0 C = RU, ST = exam, L = Exam, O = exam, OU = exam, CN = mail.exam.org, emailAddress = root@exam.org
verify error:num=18:self signed certificate
verify return:1
depth=0 C = RU, ST = exam, L = Exam, O = exam, OU = exam, CN = mail.exam.org, emailAddress = root@exam.org
verify return:1
---
Certificate chain
 0 s:/C=RU/ST=LG/L=Exam/O=exam/OU=exam/CN=mail.exam.org/emailAddress=root@exam.org
   i:/C=RU/ST=LG/L=Exam/O=exam/OU=exam/CN=mail.exam.org/emailAddress=root@exam.org
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=RU/ST=LG/L=Exam/O=exam/OU=exam/CN=mail.exam.org/emailAddress=root@exam.org
issuer=/C=RU/ST=LG/L=Exam/O=exam/OU=exam/CN=mail.exam.org/emailAddress=root@exam.org
---
No client certificate CA names sent
Peer signing digest: SHA512
Server Temp Key: ECDH, P-256, 256 bits
---
SSL handshake has read 1823 bytes and written 450 bytes
---
New, TLSv1/SSLv3, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : TLSv1.2
    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
    Session-ID: CA6F1666A484F379B28F9D9CB4A0246661DADD1A7E3523EF5BF4D649CC3D19C1
    Session-ID-ctx:
    Master-Key: 3510D27BF58BB6E305D60454D29B5A44BB29524AEA0DBD47E9E08E9A12A2E7736002DDD3C302D9DAF00C0A5AD8B7C829
    Key-Arg   : None
    Krb5 Principal: None
    PSK identity: None
    PSK identity hint: None
    TLS session ticket lifetime hint: 3600 (seconds)
    TLS session ticket:
    0000 - 4b 16 2f db 2c 15 04 7a-5d 44 00 de 46 76 c1 6d   K./.,..z]D..Fv.m
    0010 - 64 fb 60 99 54 56 c7 f6-8d 53 a0 2e 9c 72 31 e1   d.`.TV...S...r1.
    0020 - b1 18 5a dd b3 fd a6 4e-12 ad 97 a2 84 c6 65 38   ..Z....N......e8
    0030 - bc 16 1c 58 0d 84 5e 12-58 d0 c0 fa 10 24 7a 05   ...X..^.X....$z.
    0040 - f7 92 df d6 7d d7 29 8e-50 df 27 cd 23 a6 46 55   ....}.).P.'.#.FU
    0050 - bc bc a6 31 03 bc 7d 6e-d3 36 6c 9a 64 75 fe 2b   ...1..}n.6l.du.+
    0060 - b3 65 fe 4b f6 7b 7f ed-17 65 b8 62 9c 20 cd dc   .e.K.{...e.b. ..
    0070 - 7f 7b 38 79 90 71 ae d4-9d 3b 8e ec 3c ef d5 08   .{8y.q...;..<...
    0080 - 49 41 f1 0f ab 44 e2 05-16 e6 85 18 a5 73 8e d2   IA...D.......s..
    0090 - e9 14 b5 2c c5 8e d8 00-54 dc a3 dd 83 8f e9 dc   ...,....T.......

    Start Time: 1580800026
    Timeout   : 300 (sec)
    Verify return code: 18 (self signed certificate)
---
250 DSN
ehlo localhost
250-mail.exam.org
250-PIPELINING
250-SIZE 20000000
250-AUTH PLAIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
^C

Authentication errors are always annoying, especially when you’re sure the logins are correct.

One such error in Roundcube is “SMTP error 250 authentication failed“.

This usually happens when customers try to send emails from their Roundcube webmail client.

At Bobcares, we resolve these email errors as part of Dedicated Support Services to our customers.

Today, we’ll discuss the top 3 reasons for this error and how we fix them.

Roundcube SMTP error 250 authentication failed – A Brief idea

Most web hosts now use SMTP AUTH on their servers. This prevents the server from being used as open relays and spam.

SMTP authentication allows the email sender to login to the email server using an authentication mechanism. In other words, only trusted users can send data via the SMTP server.

Customers usually see this error when they try to send emails using Roundcube email client. For instance, the complete error looks like this:

An error has occurred!
SMTP Error (250): Authentication failed.

So, our Support Experts check the mail server logs(/var/log/maillog or /var/log/exim_mainlog) and roundcube error logs. In addition to that, we enable SMTP debugging in roundcube configuration file. For example, on Plesk servers, we add the following code in the roundcube configuration file /usr/share/psa-roundcube/config/defaults.inc.php to enable SMTP debugging.

$config['debug_level'] = 1;
$config['smtp_debug'] = true;

This helps us to identify the origin of the issue.

Roundcube SMTP error 250 authentication failed – Causes & Fixes

Now, let’s see the common reasons for this error and how our Dedicated Engineers fix them.

1) Incorrect authentication settings in SMTP server

Roundcube SMTP error 250 authentication failed usually occurs when there is incorrect SMTP authentication setting in the email server configuration.

For example, one of the common mistakes that we see on Postfix servers is that users enable complex authentication methods such as CRAM MD5 in Postfix mail server. But, Roundcube doesn’t support this authentication. That is, users set the following authentication option in Postifx configuration file /etc/postifx/main.cf.

smtpd_sasl_security_options = noanonymous, noplaintext

This means that the server won’t support normal authentication mechanisms such as LOGIN, PLAIN, etc and roundcube throws this error.

Similarly, on Plesk servers, we’ve seen instances where Postifx is configured for SMTP authentication over TLS, but it’s not configured correctly. This can also create problems.

How we fix?

In such cases, our Support Engineers fix this by enabling PLAIN and LOGIN authentication mechanisms. For example, on Postfix servers, we add the following line.

smtpd_sasl_security_options = noanonymous

Customers can then login and send emails via Roundcube using the username and password.

Moreover, on Plesk servers, we ensure that SMTP authentication is enabled from Tools & Settings > Mail Server Settings > Relay options > Relaying.

In addition to that, we enable SMTP service on port 587 for all IPs from Tools & Settings > Mail Server Settings.

Also, we make sure that the following parameters are disabled in the Postifx configuration file.

smtpd_tls_exclude_ciphers
smtpd_sasl_security_options
smtpd_tls_auth_only
tls_ssl_options

2) Certificate mismatch issues

This usually happens when the mail server is configured to use SSL/TLS, but roundcube is not configured to use the proper certificate.

For example, one of the common mistakes that we see on cPanel servers is that customers setup Roundcube to use TLS for sending.

$config['smtp_server'] = 'tls://localhost;

However, this can sometimes conflicts with the SSL host value in /etc/exim.cert file and create problems.

How we fix?

In such case, our Support Engineers add the server hostname in the Rouncube configuration file.

$config['smtp_server'] = 'tls://serverhostname.com';

Therefore, we confirm that the hostname matches the SSL host in /etc/exim.cert file.

3) Roundcube configuration issues

Most web hosts use port 587 for SMTP authentication. We’ve seen instances where roundcube configuration settings aren’t properly configured to support SMTP authentication.

How we fix?

Here, our Support Engineers ensure that Roundcube is configured properly to support SMTP authentication. Most importantly, we make sure that the following parameters in Roundcube configuration file config.inc.php are set correctly.

$config['default_host'] = 'tls://server.hostname.com';
$config['smtp_port'] = 587;
$config['smtp_auth_type'] = 'LOGIN';

In addition to that, we tweak the following entries in Roundcube configuration file.

$config['smtp_user'] = '%u';
$config['smtp_pass'] = '%p';

In the above setting, Rouncube uses the current user and current user’s password for logging in. This can sometimes create problems. So, for a safer side, we set blank entries for these parameters.

$config['smtp_user'] = ' ';
$config['smtp_pass'] = ' ';

[Need an Expert to look into your annoying email errors? Our Support Engineers are here 24/7].

Conclusion

In short, roundcube SMTP error 250 authentication failed can mainly occur due to SMTP authentication settings in the mail server or in the Roundcube email client. Today, we’ve discussed the main reasons for this error and how our Dedicated Engineers fix them.

var google_conversion_label = «owonCMyG5nEQ0aD71QM»;

Topic: Can’t send — smtp error 250  (Read 16001 times)