Postfix & mail forwarding loop

Discussion in 'Server Operation' started by varnik, Nov 11, 2006.

  1. varnik

    varnik New Member

    Hallo 2 all,

    since 3-4 weeks exists a problem with my postfix server under SuSE 10. One account recieves all incoming mails perfect. Only the sender recieves a mail that his mail is undeliverable.

    This is the Postfix program at host mail.brzen.de.

    I'm sorry to have to inform you that your message could not
    be delivered to one or more recipients. It's attached below.

    For further assistance, please send mail to <postmaster>

    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.

    The Postfix program

    <[email protected]>: mail forwarding loop for [email protected]

    No aliases, no virtual users. All users exist in the linux system. All users except the user "support" have no the problem.
    The search in google has not helped. :(
     
    Last edited: Dec 5, 2006
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Have you added a forward for the user support in ISPConfig?
     
  3. varnik

    varnik New Member

    Sorry, a false topic. I don't use ISPConfig. Could you move my question in the proper thread?
     
  4. falko

    falko Super Moderator ISPConfig Developer

    You have a mail loop somewhere. What's in /etc/postfix/main.cf (please strip out the comments)?

    Do you use virtual users or system users for your email accounts?
     
  5. varnik

    varnik New Member

    Code:
    queue_directory = /var/spool/postfix
    command_directory = /usr/sbin
    daemon_directory = /usr/lib/postfix
    mail_owner = postfix
    default_privs = nobody
    mydomain = brzen.de
    myorigin = $mydomain
    unknown_local_recipient_reject_code = 550
    mynetworks = 212.34.160.79, 172.16.0.0/12, 127.0.0.0/8, 192.168.1.0/24
    smtpd_banner = $myhostname ESMTP $mail_name
    
    debug_peer_level = 2
    debugger_command =
    	 PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
    	 xxgdb $daemon_directory/$process_name $process_id & sleep 5
    sendmail_path = /usr/sbin/sendmail
    newaliases_path = /usr/bin/newaliases
    mailq_path = /usr/bin/mailq
    setgid_group = maildrop
    html_directory = /usr/share/doc/packages/postfix/html
    manpage_directory = /usr/share/man
    sample_directory = /usr/share/doc/packages/postfix/samples
    readme_directory = /usr/share/doc/packages/postfix/README_FILES
    inet_protocols = all
    biff = no
    mail_spool_directory = /var/mail
    canonical_maps = hash:/etc/postfix/canonical
    virtual_alias_maps = hash:/etc/postfix/virtual
    virtual_alias_domains = hash:/etc/postfix/virtual
    relocated_maps = hash:/etc/postfix/relocated
    transport_maps = hash:/etc/postfix/transport
    sender_canonical_maps = hash:/etc/postfix/sender_canonical
    masquerade_exceptions = root
    masquerade_classes = envelope_sender, header_sender, header_recipient
    myhostname = mail.brzen.de
    program_directory = /usr/lib/postfix
    inet_interfaces = all
    masquerade_domains = 
    mydestination = $myhostname, localhost.$mydomain, $mydomain, localhost
    defer_transports = 
    mynetworks_style = subnet
    disable_dns_lookups = no
    
    I have system users without shell.
     
    Last edited: Dec 5, 2006
  6. falko

    falko Super Moderator ISPConfig Developer

    What's in /etc/postfix/virtual, /etc/postfix/transport, /etc/postfix/relocated, /etc/postfix/canonical, and /etc/postfix/sender_canonical
     
  7. varnik

    varnik New Member

    The content in these files is commented out.
     
  8. falko

    falko Super Moderator ISPConfig Developer

    Please post the output of
    Code:
    ls -la /etc/postfix
    and
    Code:
    grep support /etc/passwd
     
  9. varnik

    varnik New Member

    Code:
    total 338
    drwxr-xr-x  2 root root  1120 Nov 13 08:39 .
    drwxr-xr-x 61 root root  5168 Nov 11 12:27 ..
    -rw-r--r--  1 root root 11942 May  2  2006 LICENSE
    -rw-r--r--  1 root root  1629 May  2  2006 TLS_LICENSE
    -rw-r--r--  1 root root 15647 May  2  2006 access
    -rw-r--r--  1 root root 12288 Jul 20 10:38 access.db
    -rw-r--r--  1 root root 10947 May  2  2006 canonical
    -rw-r--r--  1 root root 12288 Nov 11 10:40 canonical.db
    -rw-r--r--  1 root root   449 May  2  2006 dynamicmaps.cf
    -rw-r--r--  1 root root  9622 May  2  2006 generic
    -rw-r--r--  1 root root 16393 May  2  2006 header_checks
    -rw-r--r--  1 root root 27602 Nov 13 08:39 main.cf
    -rw-r--r--  1 root root 27374 Jul 27 10:03 main.cf.SuSEconfig
    -rw-r--r--  1 root root   122 May  2  2006 main.cf.default
    -rw-r--r--  1 root root   970 May  2  2006 makedefs.out
    -rw-r--r--  1 root root  4023 Oct 18 11:26 master.cf
    -rw-r--r--  1 root root  4023 Oct 18 10:14 master.cf.1
    -rw-r--r--  1 root root  6741 Oct 18 11:26 master.cf.2
    -rw-r--r--  1 root root  4501 Jul 28 12:31 master.cf.new
    -rw-r--r--  1 root root  4023 Jul 28 12:19 master.cf.orig
    -rw-r--r--  1 root root  2255 May  2  2006 openssl_postfix.conf.in
    -rwxr-xr-x  1 root root 22018 May  2  2006 post-install
    -rw-r--r--  1 root root 14561 May  2  2006 postfix-files
    -rwxr-xr-x  1 root root  6366 May  2  2006 postfix-script
    -rw-r--r--  1 root root   199 May  2  2006 relay_ccerts
    -rw-r--r--  1 root root 12288 Jul 20 10:38 relay_ccerts.db
    -rw-r--r--  1 root root  6523 May  2  2006 relocated
    -rw-r--r--  1 root root 12288 Jul 20 10:38 relocated.db
    -rw-------  1 root root   172 May  2  2006 sasl_passwd
    -rw-------  1 root root 12288 Jul 20 10:38 sasl_passwd.db
    -rw-r--r--  1 root root   412 May  2  2006 sender_canonical
    -rw-r--r--  1 root root 12288 Jul 20 10:38 sender_canonical.db
    -rw-r--r--  1 root root 11033 May  2  2006 transport
    -rw-r--r--  1 root root 12288 Jul 20 10:38 transport.db
    -rw-r--r--  1 root root 11732 May  2  2006 virtual
    -rw-r--r--  1 root root 12288 Nov 11 10:34 virtual.db
    
    Code:
    support:x:1000:100::/home/support:/bin/bash
    
    Hallo Falko,

    vielen Dank für deine Hilfe. Das Problem ist gelöst. Ich habe vermutlich vergessen, postmap nach der Änderung einer Datenbank-Datei aufzurufen.
     
    Last edited: Nov 15, 2006
  10. varnik

    varnik New Member

    The problem exists. The history is repeated. I have found strange lines in /var/log/mail.
    Code:
    #A client 192.168.1.27 tries to send a message as [email protected] to the user [email protected]
    Nov 21 12:42:39 mail postfix/smtpd[2990]: connect from unknown[192.168.1.27]
    Nov 21 12:42:39 mail postfix/smtpd[2990]: 56FE9105D: client=unknown[192.168.1.27]
    Nov 21 12:42:39 mail postfix/cleanup[2988]: 56FE9105D: message-id=<001001c70d62$619f3b90$[email protected]>
    Nov 21 12:42:39 mail postfix/qmgr[2984]: 56FE9105D: from=<[email protected]>, size=877, nrcpt=1 (queue active)
    Nov 21 12:42:39 mail postfix/smtpd[2990]: disconnect from unknown[192.168.1.27]
    # So the client is disconnected.
    
    # Postfix does his job
    
    Nov 21 12:42:57 mail postfix/smtpd[2985]: connect from localhost[127.0.0.1]
    Nov 21 12:42:57 mail postfix/smtpd[2985]: D62C0104E: client=localhost[127.0.0.1]
    Nov 21 12:42:57 mail postfix/cleanup[2988]: D62C0104E: message-id=<001001c70d62$619f3b90$[email protected]>
    Nov 21 12:42:57 mail postfix/qmgr[2984]: D62C0104E: from=<[email protected]>, size=1274, nrcpt=1 (queue active)
    Nov 21 12:42:57 mail postfix/smtpd[2985]: disconnect from localhost[127.0.0.1]
    Nov 21 12:42:58 mail amavis[2578]: (02578-03) Passed CLEAN, [192.168.1.27] <[email protected]> -> <[email protected]>, Message-ID: <001001c70d62$619f3b90$[email protected]>, mail_id: CwYa7HKCzsfq, Hits: -4.399, 18319 ms
    Nov 21 12:42:58 mail postfix/local[2989]: D62C0104E: to=<[email protected]>, relay=local, delay=1, status=sent (delivered to mailbox)
    Nov 21 12:42:58 mail postfix/qmgr[2984]: D62C0104E: removed
    Nov 21 12:42:58 mail postfix/smtp[2991]: 56FE9105D: to=<[email protected]>, relay=127.0.0.1[127.0.0.1], delay=19, status=sent (250 2.6.0 Ok, id=02578-03, from MTA([127.0.0.1]:10025): 250 Ok: queued as D62C0104E)
    Nov 21 12:42:58 mail postfix/qmgr[2984]: 56FE9105D: removed
    # The mail was proved by amavis and is just delivered.
    
    # This is a dynamic ip-address (with the dynamically given hostname)
    # The address doesn't exist in the configuration and 
    # doesn't belong to our network.
    Nov 21 12:44:46 mail popper[3010]: (v4.0.8) Servicing request from "p5494a610.dip0.t-ipconnect.de" at 84.148.166.16 [pop_init.c:1239]
    Nov 21 12:44:55 mail popper[3010]: Stats: support 0 0 67 23861790 p5494a610.dip0.t-ipconnect.de 84.148.166.16 [pop_updt.c:301]
    Nov 21 12:44:57 mail postfix/smtpd[2990]: connect from mx.odn.de[212.34.160.79]
    Nov 21 12:44:58 mail postfix/smtpd[2990]: 8A81BC37: client=mx.odn.de[212.34.160.79]
    Nov 21 12:44:58 mail postfix/cleanup[3011]: 8A81BC37: message-id=<001001c70d62$619f3b90$[email protected]>
    Nov 21 12:44:58 mail postfix/smtpd[2990]: disconnect from mx.odn.de[212.34.160.79]
    Nov 21 12:44:58 mail postfix/qmgr[2984]: 8A81BC37: from=<[email protected]>, size=2036, nrcpt=1 (queue active)
    Nov 21 12:45:20 mail postfix/smtpd[3038]: connect from localhost[127.0.0.1]
    Nov 21 12:45:20 mail postfix/smtpd[3038]: 96FEC104F: client=localhost[127.0.0.1]
    Nov 21 12:45:20 mail postfix/cleanup[3011]: 96FEC104F: message-id=<001001c70d62$619f3b90$[email protected]>
    Nov 21 12:45:20 mail postfix/qmgr[2984]: 96FEC104F: from=<[email protected]>, size=2433, nrcpt=1 (queue active)
    Nov 21 12:45:20 mail postfix/smtpd[3038]: disconnect from localhost[127.0.0.1]
    Nov 21 12:45:21 mail postfix/local[3039]: 96FEC104F: to=<[email protected]>, relay=local, delay=1, status=bounced (mail forwarding loop for [email protected])
    Nov 21 12:45:21 mail postfix/cleanup[3011]: 47D10105B: message-id=<[email protected]>
    Nov 21 12:45:21 mail amavis[2577]: (02577-03) Passed CLEAN, [84.148.166.16] <[email protected]> -> <[email protected]>, Message-ID: <001001c70d62$619f3b90$[email protected]>, mail_id: XowjCsoSec9X, Hits: -2.56, 20441 ms
    Nov 21 12:45:21 mail postfix/qmgr[2984]: 47D10105B: from=<>, size=4075, nrcpt=1 (queue active)
    Nov 21 12:45:21 mail postfix/qmgr[2984]: 96FEC104F: removed
    Nov 21 12:45:21 mail postfix/smtp[3012]: 8A81BC37: to=<[email protected]>, relay=127.0.0.1[127.0.0.1], delay=24, status=sent (250 2.6.0 Ok, id=02577-03, from MTA([127.0.0.1]:10025): 250 Ok: queued as 96FEC104F)
    Nov 21 12:45:21 mail postfix/qmgr[2984]: 8A81BC37: removed
    Nov 21 12:45:22 mail postfix/local[3039]: 47D10105B: to=<[email protected]>, relay=local, delay=1, status=sent (delivered to mailbox)
    Nov 21 12:45:22 mail postfix/qmgr[2984]: 47D10105B: removed
    
    
    Why does this unknown client try to send this email? Relay is only for RELAYHOST=mx.odn.de open. What do i false?

    PS: I would speak german, because my english is poor. Will it be accepted?
     
    Last edited: Dec 5, 2006
  11. falko

    falko Super Moderator ISPConfig Developer

    Is there maybe a forwarding from support to a10 and then from a10 to support?

    Please try to post in English so that everyone can participate.
     
  12. varnik

    varnik New Member

    The account a10 is made only for test, because this is the only computer which I don't change permanent. For this account doesn't exist any forwarding. For user "support" IMHO also. I have checked all database configuration files in /etc/postfix. /etc/aliases is also by default. In what files can this loop "be configured"?
     
    Last edited: Dec 15, 2006
  13. falko

    falko Super Moderator ISPConfig Developer

    You can search for the string "support" in all the files on your system like this:
    Code:
    cd /
    grep -R support *
    Maybe you find the file where it is configured.
     
  14. varnik

    varnik New Member

    Alas! Coudn't find anything. :( More ideas?
     
  15. falko

    falko Super Moderator ISPConfig Developer

    Then there shouldn't be a mail loop... :confused:
     
  16. varnik

    varnik New Member

    Unfortunately, there is one. And nobody can say where. Have you looked my log? :confused:
     
  17. falko

    falko Super Moderator ISPConfig Developer

    Yes, I looked at your log.
     
  18. tycho

    tycho New Member

    Does the file .forward exist in the /home/support directory?
     
  19. varnik

    varnik New Member

    No, it doesn't.
    :(
     
  20. Robin Thomas

    Robin Thomas New Member

    Hey, I am facing the same problem with the mail forwarding loop. In my case the message is
    The Postfix program

    <[email protected]>: mail forwarding loop for [email protected]

    The user1 has a .forward file in his home directory. Can this be a problem?
     

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