SMTP Servie is Offline

Discussion in 'General' started by Ernalyn Longcop, Jun 2, 2016.

  1. Ernalyn Longcop

    Ernalyn Longcop New Member

    Help!
    New to ISPCOnfig.
    My SMTP Service is Offline.

    I tried to check if postfix is running and it is.. but I can't see it when I run netstat -plnt

    I checked postfix status:
    [email protected]:/# service postfix status
    * postfix is running
    [email protected]:/# service postfix stop
    * Stopping Postfix Mail Transport Agent postfix [ OK ]
    [email protected]:/# service postfix start
    * Starting Postfix Mail Transport Agent postfix [ OK ]
    [email protected]:/# service postfix status
    * postfix is running
    There is an error: /var/mail/mail.log screenshot attached:

    Thank you for the help.
     

    Attached Files:

    Last edited: Jun 2, 2016
  2. till

    till Super Moderator Staff Member ISPConfig Developer

    Restart postfix and then check the mail.log file for errors.
     
  3. Ernalyn Longcop

    Ernalyn Longcop New Member

    Restarted Postfix and here is the error:
    Jun 8 01:20:01 ap dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<sSCpS7402QAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 01:20:01 ap dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<10WpS740yQAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 01:20:01 ap postfix/postqueue[588]: warning: Mail system is down -- accessing queue directly
     
  4. till

    till Super Moderator Staff Member ISPConfig Developer

    The first two lines are success messages of the pop3 and imap monitor, the last line just says that it is down but no sign of the restart which should be there. Which Distribution do you use and which command did you use to restart postfix?
     
  5. Ernalyn Longcop

    Ernalyn Longcop New Member

    Distribution of what sir?
    I have ISPConfig 3.0.5 4p9
    I use postfix reload, i also tried postfix stop then postfix start:
    [email protected]:/# postfix status
    postfix/postfix-script: the Postfix mail system is running: PID: 24635
    [email protected]:/# postfix stop
    postfix/postfix-script: stopping the Postfix mail system
    [email protected]:/# postfix start
    postfix/postfix-script: starting the Postfix mail system

    I also tried to check from ISPConfig Mail error Log:
    Jun 7 10:03:05 ap postfix[23179]: fatal: myhostname and relayhost parameter settings must not be identical: mx.globalnaz.org
    Jun 7 10:03:06 ap postfix[23181]: fatal: myhostname and relayhost parameter settings must not be identical: mx.globalnaz.org
    Jun 7 10:05:41 ap postfix/postqueue[24945]: fatal: Cannot flush mail queue - mail system is down
    Jun 8 03:39:21 ap postfix/postfix-script[3574]: error: unknown command: ''
    Jun 8 03:39:21 ap postfix/postfix-script[3575]: fatal: usage: postfix start (or stop, reload, abort, flush, check, status, set-permissions, upgrade-configuration)
     
  6. till

    till Super Moderator Staff Member ISPConfig Developer

    Linux Distribution.

    Ok, that's the issue. You can not say postfix to send all outgoing emails to itself as this will produce a never ending loop. Set relayhost so that it is empty:

    relayhost =

    in /etc/postfix/main.cf and restart the server. Or change the hostname of your server to another name in /etc/hosts, /etc/mailname, /etc/hostname and /etc/postfix/main.cf
     
  7. Ernalyn Longcop

    Ernalyn Longcop New Member

    Linux Distribution: Ubuntu 14.04.3
    I edited it then restart server, still getting this error:

    Jun 8 04:15:38 ap postfix/postfix-script[4608]: the Postfix mail system is running: PID: 3748
    Jun 8 04:20:01 ap dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<hFhoz8A0MAAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 04:20:01 ap dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<5YJoz8A0IAAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 04:20:01 ap postfix/postqueue[4689]: warning: Mail system is down -- accessing queue directly
     
  8. Ernalyn Longcop

    Ernalyn Longcop New Member

    I dont know if this would help:
    when I run the netstat, PID 3748 gives me this.
    tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 3748/master
     
  9. till

    till Super Moderator Staff Member ISPConfig Developer

    Check the email error.log again.
     
  10. Ernalyn Longcop

    Ernalyn Longcop New Member

    I am looking at /var/log/mail.err gives me this:
    Jun 7 10:03:05 ap postfix[23179]: fatal: myhostname and relayhost parameter settings must not be identical: mx.globalnaz.org
    Jun 7 10:03:06 ap postfix[23181]: fatal: myhostname and relayhost parameter settings must not be identical: mx.globalnaz.org
    Jun 7 10:05:41 ap postfix/postqueue[24945]: fatal: Cannot flush mail queue - mail system is down
    Jun 8 03:39:21 ap postfix/postfix-script[3574]: error: unknown command: ''
    Jun 8 03:39:21 ap postfix/postfix-script[3575]: fatal: usage: postfix start (or stop, reload, abort, flush, check, status, set-permissions, upgrade-configuration)
    ~

    It looks like, it has not changed. The log is not updated. It should be PID: 3748
     
  11. till

    till Super Moderator Staff Member ISPConfig Developer

    seems as you used a wrong command to restart postfix. Use e.f.

    service postfix restart

    to restart postfix.
     
  12. Ernalyn Longcop

    Ernalyn Longcop New Member

    I restarted postfix it gives me this error:
    Jun 8 21:25:02 ap postfix/postqueue[1041]: warning: Mail system is down -- accessing queue directly
    Jun 8 21:25:57 ap postfix/master[29740]: terminating on signal 15
    Jun 8 21:25:57 ap postfix/master[1287]: daemon started -- version 2.11.0, configuration /etc/postfix
    Jun 8 21:26:51 ap postfix/postfix-script[1309]: the Postfix mail system is running: PID: 1287
    Jun 8 21:30:01 ap dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<Gxz4Ms80WgAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 21:30:01 ap dovecot: imap-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<ATj4Ms80SgAAAAAAAAAAAAAAAAAAAAAB>
    Jun 8 21:30:01 ap postfix/postqueue[1374]: warning: Mail system is down -- accessing queue directly

    Also, when I run netstart PID 1287 is not listening to port 25
    Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
    tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 32454/pure-ftpd (SE
    tcp 0 0 192.168.230.203:53 0.0.0.0:* LISTEN 13645/named
    tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 13645/named
    tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 927/sshd
    tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN 13645/named
    tcp 0 0 0.0.0.0:993 0.0.0.0:* LISTEN 13576/dovecot
    tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 13576/dovecot
    tcp 0 0 127.0.0.1:10024 0.0.0.0:* LISTEN 12525/amavisd-new (
    tcp 0 0 127.0.0.1:10025 0.0.0.0:* LISTEN 1287/master
    tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 11856/mysqld
    tcp 0 0 0.0.0.0:587 0.0.0.0:* LISTEN 1287/master
    tcp 0 0 127.0.0.1:11211 0.0.0.0:* LISTEN 2208/memcached
    tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 13576/dovecot
    tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 13576/dovecot
    tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN 30581/perl
    tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN 1287/master
    tcp6 0 0 :::21 :::* LISTEN 32454/pure-ftpd (SE
    tcp6 0 0 :::53 :::* LISTEN 13645/named
    tcp6 0 0 :::22 :::* LISTEN 927/sshd
    tcp6 0 0 ::1:953 :::* LISTEN 13645/named
    tcp6 0 0 :::443 :::* LISTEN 1319/apache2
    tcp6 0 0 :::993 :::* LISTEN 13576/dovecot
    tcp6 0 0 :::995 :::* LISTEN 13576/dovecot
    tcp6 0 0 :::587 :::* LISTEN 1287/master
    tcp6 0 0 :::110 :::* LISTEN 13576/dovecot
    tcp6 0 0 :::143 :::* LISTEN 13576/dovecot
    tcp6 0 0 :::9999 :::* LISTEN 30968/nodejs
    tcp6 0 0 :::8080 :::* LISTEN 1319/apache2
    tcp6 0 0 :::80 :::* LISTEN 1319/apache2
    tcp6 0 0 :::465 :::* LISTEN 1287/master
    tcp6 0 0 :::8081 :::* LISTEN 1319/apache2

    Checked ISPConfig monitor:
    Web-Server:Online
    FTP-Server:Online
    SMTP-Server:Offline
    POP3-Server:OnlineI
    MAP-Server:Online
    DNS-Server:Online
    mySQL-Server:Online
     
  13. Ernalyn Longcop

    Ernalyn Longcop New Member

    Hi,

    I changed master.cf file to include this line:
    smtp inet n - n - - smtpd

    It is now listening to port 25 and the ISP Config Monitor now says that SMTP server is now Online.

    However, it is still not sending mails. Looking at mail.log:
    Jun 9 00:30:01 ap postfix/smtpd[26507]: connect from localhost[::1]
    Jun 9 00:30:01 ap dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<ouGzttE0pAAAAAAAAAAAAAAAAAAAAAAB>
    Jun 9 00:30:01 ap dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<NfCzttE0tAAAAAAAAAAAAAAAAAAAAAAB>
    Jun 9 00:30:01 ap postfix/smtpd[26507]: lost connection after CONNECT from localhost[::1]
    Jun 9 00:30:01 ap postfix/smtpd[26507]: disconnect from localhost[::1]
    Jun 9 00:30:01 ap postfix/postqueue[26521]: warning: Mail system is down -- accessing queue directly

    Thanks for helping us out.
     
  14. till

    till Super Moderator Staff Member ISPConfig Developer

    Please post your complete master.cf file.
     
  15. Ernalyn Longcop

    Ernalyn Longcop New Member

    submission inet n - - - - smtpd
    -o syslog_name=postfix/submission
    -o smtpd_tls_security_level=encrypt
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_client_restrictions=permit_sasl_authenticated,reject

    smtp inet n - n - - smtpd

    smtps inet n - - - - smtpd
    -o syslog_name=postfix/smtps
    -o smtpd_tls_wrappermode=yes
    -o smtpd_sasl_auth_enable=yes
    -o smtpd_client_restrictions=permit_sasl_authenticated,reject

    #amavis unix - - - - 2 smtp
    # -o smtp_data_done_timeout=1200
    # -o smtp_send_xforward_command=yes
    #

    127.0.0.1:10025 inet n - - - - smtpd
    -o content_filter=
    -o local_recipient_maps=
    -o relay_recipient_maps=
    -o smtpd_restriction_classes=
    -o smtpd_client_restrictions=
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o smtpd_recipient_restrictions=permit_mynetworks,reject
    -o mynetworks=127.0.0.0/8
    -o strict_rfc821_envelopes=yes
    -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks

    flush unix n - - 1000? 0 flush
    proxymap unix - - n - - proxymap
    trace unix - - - - 0 bounce
    verify unix - - - - 1 verify
    tlsmgr unix - - - 1000? 1 tlsmgr
    anvil unix - - - - 1 anvil
    scache unix - - - - 1 scache
    discard unix - - - - - discard
    retry unix - - - - - error
    relay unix - - n - - smtp -o smtp_fallback_relay=
    # -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
    dovecot unix - n n - - pipe
    flags=DROhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${nexthop}
    ~
     
  16. till

    till Super Moderator Staff Member ISPConfig Developer

    Seems as if someone removed all the lines that ubuntu adds by default so that only the additions that ispconfig added are there. Here is the complete master.cf that you get when you follow the perfect server guide for ubuntu 14.04:

    Code:
    #
    # Postfix master process configuration file.  For details on the format
    # of the file, see the master(5) manual page (command: "man 5 master" or
    # on-line: http://www.postfix.org/master.5.html).
    #
    # 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       -       -       -       -       smtpd
    #smtp      inet  n       -       -       -       1       postscreen
    #smtpd     pass  -       -       -       -       -       smtpd
    #dnsblog   unix  -       -       -       -       0       dnsblog
    #tlsproxy  unix  -       -       -       -       0       tlsproxy
    submission inet n       -       -       -       -       smtpd
      -o syslog_name=postfix/submission
      -o smtpd_tls_security_level=encrypt
      -o smtpd_sasl_auth_enable=yes
      -o smtpd_client_restrictions=permit_sasl_authenticated,reject
    #  -o smtpd_reject_unlisted_recipient=no
    #  -o smtpd_client_restrictions=$mua_client_restrictions
    #  -o smtpd_helo_restrictions=$mua_helo_restrictions
    #  -o smtpd_sender_restrictions=$mua_sender_restrictions
    #  -o smtpd_recipient_restrictions=
    #  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
    #  -o milter_macro_daemon_name=ORIGINATING
    smtps     inet  n       -       -       -       -       smtpd
      -o syslog_name=postfix/smtps
      -o smtpd_tls_wrappermode=yes
      -o smtpd_sasl_auth_enable=yes
      -o smtpd_client_restrictions=permit_sasl_authenticated,reject
    #  -o smtpd_reject_unlisted_recipient=no
    #  -o smtpd_client_restrictions=$mua_client_restrictions
    #  -o smtpd_helo_restrictions=$mua_helo_restrictions
    #  -o smtpd_sender_restrictions=$mua_sender_restrictions
    #  -o smtpd_recipient_restrictions=
    #  -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
    #  -o milter_macro_daemon_name=ORIGINATING
    #628       inet  n       -       -       -       -       qmqpd
    pickup    unix  n       -       -       60      1       pickup
    cleanup   unix  n       -       -       -       0       cleanup
    qmgr      unix  n       -       n       300     1       qmgr
    #qmgr     unix  n       -       n       300     1       oqmgr
    tlsmgr    unix  -       -       -       1000?   1       tlsmgr
    rewrite   unix  -       -       -       -       -       trivial-rewrite
    bounce    unix  -       -       -       -       0       bounce
    defer     unix  -       -       -       -       0       bounce
    trace     unix  -       -       -       -       0       bounce
    verify    unix  -       -       -       -       1       verify
    flush     unix  n       -       -       1000?   0       flush
    proxymap  unix  -       -       n       -       -       proxymap
    proxywrite unix -       -       n       -       1       proxymap
    smtp      unix  -       -       -       -       -       smtp
    relay     unix  -       -       -       -       -       smtp
    #       -o smtp_helo_timeout=5 -o smtp_connect_timeout=5
    showq     unix  n       -       -       -       -       showq
    error     unix  -       -       -       -       -       error
    retry     unix  -       -       -       -       -       error
    discard   unix  -       -       -       -       -       discard
    local     unix  -       n       n       -       -       local
    virtual   unix  -       n       n       -       -       virtual
    lmtp      unix  -       -       -       -       -       lmtp
    anvil     unix  -       -       -       -       1       anvil
    scache    unix  -       -       -       -       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/bin/maildrop -d vmail ${extension} ${recipient} ${user} ${nexthop} ${sender}
    #
    # ====================================================================
    #
    # 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=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
    #
    # ====================================================================
    # Old example of delivery via Cyrus.
    #
    #old-cyrus unix  -       n       n       -       -       pipe
    #  flags=R user=cyrus argv=/cyrus/bin/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/lib/bsmtp/bsmtp -t$nexthop -f$sender $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=DROhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${nexthop}
    amavis unix - - - - 2 smtp
            -o smtp_data_done_timeout=1200
            -o smtp_send_xforward_command=yes
    
    127.0.0.1:10025 inet n - - - - smtpd
            -o content_filter=
            -o local_recipient_maps=
            -o relay_recipient_maps=
            -o smtpd_restriction_classes=
            -o smtpd_client_restrictions=
            -o smtpd_helo_restrictions=
            -o smtpd_sender_restrictions=
            -o smtpd_recipient_restrictions=permit_mynetworks,reject
            -o mynetworks=127.0.0.0/8
            -o strict_rfc821_envelopes=yes
            -o receive_override_options=no_unknown_recipient_checks,no_header_body_checks
     
  17. Ernalyn Longcop

    Ernalyn Longcop New Member

    This is what I was looking for, I only found this link https://www.howtoforge.com/the-perf...d-mysql-php-postfix-dovecot-and-ispconfig3-p4

    I tried to send an email and this is what appears in the mail.log
    Jun 9 05:35:01 ap postfix/smtpd[1321]: connect from localhost[::1]
    Jun 9 05:35:01 ap dovecot: imap-login: Disconnected (disconnected before auth was ready, waited 0 secs): user=<>, rip=::1, lip=::1, secured, session=<1Cl2+dU0DgAAAAAAAAAAAAAAAAAAAAAB>
    Jun 9 05:35:01 ap dovecot: pop3-login: Disconnected (no auth attempts in 0 secs): user=<>, rip=::1, lip=::1, secured, session=<pz12+dU0HgAAAAAAAAAAAAAAAAAAAAAB>
    Jun 9 05:35:01 ap postfix/smtpd[1321]: lost connection after CONNECT from localhost[::1]
    Jun 9 05:35:01 ap postfix/smtpd[1321]: disconnect from localhost[::1]
    Jun 9 05:35:55 ap postfix/pickup[974]: E94C4140E91: uid=5006 from=<[email protected]>
    Jun 9 05:35:55 ap postfix/cleanup[1354]: E94C4140E91: message-id=<[email protected]>
    Jun 9 05:35:55 ap postfix/qmgr[975]: E94C4140E91: from=<[email protected]>, size=1387, nrcpt=1 (queue active)
    Jun 9 05:35:56 ap postfix/smtpd[1361]: connect from localhost[127.0.0.1]
    Jun 9 05:35:56 ap postfix/smtpd[1361]: 71C54140C63: client=localhost[127.0.0.1]
    Jun 9 05:35:56 ap postfix/cleanup[1354]: 71C54140C63: message-id=<[email protected]>
    Jun 9 05:35:56 ap postfix/qmgr[975]: 71C54140C63: from=<[email protected]>, size=2065, nrcpt=1 (queue active)
    Jun 9 05:35:56 ap amavis[1233]: (01233-01) Passed CLEAN {RelayedInbound}, <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 7mAr9XH7GTNg, Hits: 2.503, size: 1386, queued_as: 71C54140C63, 500 ms
    Jun 9 05:35:56 ap postfix/smtp[1357]: E94C4140E91: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.54, delays=0.02/0.01/0.01/0.5, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 71C54140C63)
    Jun 9 05:35:56 ap postfix/qmgr[975]: E94C4140E91: removed
    Jun 9 05:35:56 ap postfix/pipe[1363]: 71C54140C63: to=<[email protected]>, relay=dovecot, delay=0.04, delays=0.01/0.01/0/0.02, dsn=5.1.1, status=bounced (user unknown)
    Jun 9 05:35:56 ap postfix/cleanup[1354]: 7C546140F09: message-id=<[email protected]>
    Jun 9 05:35:56 ap postfix/qmgr[975]: 7C546140F09: from=<>, size=3894, nrcpt=1 (queue active)
    Jun 9 05:35:56 ap postfix/bounce[1367]: 71C54140C63: sender non-delivery notification: 7C546140F09
    Jun 9 05:35:56 ap postfix/qmgr[975]: 71C54140C63: removed
    Jun 9 05:35:56 ap postfix/pipe[1363]: 7C546140F09: to=<[email protected]>, relay=dovecot, delay=0.02, delays=0/0/0/0.01, dsn=5.1.1, status=bounced (user unknown)
    Jun 9 05:35:56 ap postfix/qmgr[975]: 7C546140F09: removed
     
  18. Jesse Norell

    Jesse Norell Active Member

  19. till

    till Super Moderator Staff Member ISPConfig Developer

    and ensure that the hostname of your server is a subdomain like server1.yourdomain.tld and not just yourdomain.tld and that yourdomain.tld (without the subdomain) is not used in the files /etc/mailname and /etc/postfix/main.cf.
     

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