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Thread: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

  1. #1
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    Aug 2013
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    Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Ok guys I need some help. My server does not receive any mails from outside.

    I can send mails from localhost to outside ... mymail@myserver.com to something@gmail.com
    I can send mails from local to local .. mymail1@myserver.com to mymail2@myserver.com
    I can receive mails from local ... but I can't from outside.

    Here is my postconf -n

    Code:
    alias_database = hash:/etc/aliases
    alias_maps = hash:/etc/aliases
    append_dot_mydomain = no
    biff = no
    config_directory = /etc/postfix
    inet_interfaces = all
    mailbox_size_limit = 0
    mydestination = localhost
    myhostname = mail.mydomain.eu
    mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
    myorigin = /etc/mailname
    readme_directory = no
    recipient_delimiter = +
    relayhost = smtp.myisp.xxx
    smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
    smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_path = private/auth
    smtpd_sasl_type = dovecot
    smtpd_tls_auth_only = yes
    smtpd_tls_cert_file = /etc/ssl/certs/dovecot.pem
    smtpd_tls_key_file = /etc/ssl/private/dovecot.pem
    smtpd_use_tls = yes
    virtual_alias_maps = mysql:/etc/postfix/mysql-virtual-alias-maps.cf
    virtual_mailbox_domains = mysql:/etc/postfix/mysql-virtual-mailbox-domains.cf
    virtual_mailbox_maps = mysql:/etc/postfix/mysql-virtual-mailbox-maps.cf
    virtual_transport = lmtp:unix:private/dovecot-lmtp
    iptables -L

    Code:
    Chain INPUT (policy ACCEPT)
    target     prot opt source               destination
    
    Chain FORWARD (policy ACCEPT)
    target     prot opt source               destination
    
    Chain OUTPUT (policy ACCEPT)
    target     prot opt source               destination
    mail.log & mail.err is empty

    MX is ok!

    telnet myserver.xxx 587 OK
    telnet myserver.xxx 143 OK

    telnet myserver.xxx 993

    Code:
    telnet mydomain 993
    Trying xxx.xxx.xxx.xxx...
    Connected to mydomain.
    Escape character is '^]'.
    dovecot -n

    Code:
    # 2.0.19: /etc/dovecot/dovecot.conf
    # OS: Linux 3.5.0-47-generic x86_64 Ubuntu 12.04.4 LTS ext4
    auth_mechanisms = login
    auth_verbose = yes
    mail_location = maildir:/var/mail/vhosts/%d/%n
    mail_privileged_group = vmail
    passdb {
      args = /etc/dovecot/dovecot-sql.conf.ext
      driver = sql
    }
    postmaster_address = attila@mydomain
    protocols = imap pop3 lmtp
    service auth-worker {
      user = vmail
    }
    service auth {
      unix_listener /var/spool/postfix/private/auth {
        group = postfix
        mode = 0666
        user = postfix
      }
      unix_listener auth-userdb {
        mode = 0600
        user = vmail
      }
      user = dovecot
    }
    service lmtp {
      unix_listener /var/spool/postfix/private/dovecot-lmtp {
        group = postfix
        mode = 0600
        user = postfix
      }
    }
    ssl_cert = </etc/ssl/certs/dovecot.pem
    ssl_key = </etc/ssl/private/dovecot.pem
    userdb {
      args = uid=vmail gid=vmail home=/var/mail/vhosts/%d/%n
      driver = static
    }
    cat /etc/postfix/master.cf

    Code:
    #
    # 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       -       -       -       -       smtpd -o content_filter=spamassassin
    #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 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 milter_macro_daemon_name=ORIGINATING
    #628       inet  n       -       -       -       -       qmqpd
    pickup    fifo  n       -       -       60      1       pickup
    cleanup   unix  n       -       -       -       0       cleanup
    qmgr      fifo  n       -       n       300     1       qmgr
    #qmgr     fifo  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 ${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=/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}
    
    spamassassin unix -     n       n       -       -       pipe
            user=spamd argv=/usr/bin/spamc -f -e
            /usr/sbin/sendmail -oi -f ${sender} ${recipient}
    UPDATE : for example if I send a mail from my gmail acc to my server, the connection does not even appears in logs - no non-delivery report

    dig

    Code:
    ; <<>> DiG 9.8.1-P1 <<>> mydomain mx
    ;; global options: +cmd
    ;; Got answer:
    ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 56653
    ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5
    
    ;; QUESTION SECTION:
    ;mydomain.                    IN      MX
    
    ;; ANSWER SECTION:
    mydomain.             3600    IN      MX      10 mail.mydomain.
    
    ;; AUTHORITY SECTION:
    mydomain.             39583   IN      NS      ns3.myns.
    mydomain.             39583   IN      NS      ns4.myns.
    mydomain.             39583   IN      NS      ns1.myns.
    mydomain.             39583   IN      NS      ns2.myns.
    
    ;; ADDITIONAL SECTION:
    ns1.myns.         36507   IN      A       
    ns1.myns.         40640   IN      AAAA    
    ns2.myns.         36507   IN      A       
    ns3.myns.         36507   IN      A       
    ns4.myns.         36507   IN      A
    Last edited by Br_Attila; March 29th, 2014 at 11:21 AM.

  2. #2
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Ouch. Is there a hw-firewall/router that needs port 25 forwarded?
    Does your ISP allow port 25/tcp inbound? That is the port that MTAs use.
    The other ports are just for client connections.

  3. #3
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Why are the logs empty? There should be logs is you send emails from local to outside and send mails from local to local. You need to fix this too. Logs are important for a mail server.
    How did you make sure that the MX record for you domain is setup correctly? Have you checked your domain in mxtoolbox.com?
    This is why we need to see the logs, are mails reaching the mail server and get rejected, or the emails never arrive at all?
    "I learned a lot from repeatedly breaking my system and then reinstalling. Oh, and a lot of GOOGLE searches too!"
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  4. #4
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
    That only allows traffic from localhost. You need to add your local subnet, e.g, 192.168.1.0/24, to this list. Then message traffic passing through your router will be accepted by Postfix.

    Read these documents for details:
    http://www.postfix.org/postconf.5.ht...y_restrictions
    http://www.postfix.org/SMTPD_ACCESS_README.html

    From the first of these:
    By default, the Postfix SMTP server accepts:
    • Mail from clients whose IP address matches $mynetworks, or:
    • Mail to remote destinations that match $relay_domains, except for addresses that contain sender-specified routing (user@elsewhere@domain), or:
    • Mail to local destinations that match $inet_interfaces or $proxy_interfaces, $mydestination, $virtual_alias_domains, or $virtual_mailbox_domains.
    If you ran those telnet tests from the server itself, that can be deceptive as they may be permitted by the localhost rule. You can test from another machine on your network by connecting to the server's network IP address, but ultimately you should test from a machine outside your network entirely.
    Last edited by SeijiSensei; March 30th, 2014 at 06:11 AM.
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  5. #5
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    MX records are ok,and port forwarding also is ok.but the port 25 is blocked
    that's the problem. I don't really undestand how it's worked until now ...
    logs are empty - I mean no error.

  6. #6
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Add to your master.cf:

    Code:
    26     inet  n       -       -       -       -       smtpd -o content_filter=spamassassin

    So you can use port 26 for SMTP .

  7. #7
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Quote Originally Posted by Br_Attila View Post
    MX records are ok,and port forwarding also is ok.but the port 25 is blocked
    that's the problem. I don't really undestand how it's worked until now ...
    logs are empty - I mean no error.
    Call your ISP and complain. If it is a non-residential connection, they should help. If it is for a house, there are other options ... like a cheap email gateway for $40/yr or get a VPS and run your own email gateway. The key is to have email NOT use port 25 on your home system.

    Setting up your email server to listen on a different port doesn't tell the world about it. THAT is the issue that can only be solved with an external system listening for SMTP on port 25. Period.
    Last edited by TheFu; April 3rd, 2014 at 07:31 PM.

  8. #8
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    Quote Originally Posted by TheFu View Post
    Call your ISP and complain. If it is a non-residential connection, they should help. If it is for a house, there are other options ... like a cheap email gateway for $40/yr or get a VPS and run your own email gateway. The key is to have email NOT use port 25 on your home system.

    Setting up your email server to listen on a different port doesn't tell the world about it. THAT is the issue that can only be solved with an external system listening for SMTP on port 25. Period.

    Agree, you should indeed look for a VPS to handle this. If you really need it, you can still add the line in the master.cf I have send before. Note: Adding the line, will open both 25 and 26, so it's not like 25 will close.

  9. #9
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    Re: Ubuntu Server 12.04 not receiving mails (Postfix + Dovecot + Mysql)

    OR ......

    Let the router do the port translation and leave port 25 alone so that other machines inside your network don't get confused. We have these fancy routers with all sorts of capabilities - why not use them?

    I've been doing this with ssh for years.

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