Emails not being received from external sources

Discussion in 'Installation/Configuration' started by Trevor Mills, Mar 22, 2017.

  1. Trevor Mills

    Trevor Mills New Member

    Hi there,

    I'm struggling with email.

    I'm trying to setup ISPConfig 3.1.2 on CentOS 7.3. I'm hosting three domains on the installation. I'll list the real domains here for anyone trying to help - trevormills.com, topquark.com, theyroar.com.

    When I try to send emails from any of those domains to any of those domains ( so all on the same server ), the emails get delivered. When I try and send an email from my gmail account to any of these emails, it fails silently - no bounce message in gmail, nothing in /var/log/maillog and no email delivered.

    I'm trying to use the servers mail.trevormills.com, mail.topquark.com and mail.theyroar.com respectively. Digging them shows the correct IP address ( 162.216.19.49 ).

    Please help.
    Thanks,
    Trevor
     
    Last edited: Mar 22, 2017
  2. Trevor Mills

    Trevor Mills New Member

    I think I've figured it out. Problem was in /etc/postfix/master.cf

    I had disabled listening on port 25 like this:
    Code:
    #smtp      inet  n       -       n       -       -       smtpd
    587      inet  n       -       n       -       -       smtpd
    
    I re-enabled it like this, and restarted postfix service:
    Code:
    smtp      inet  n       -       n       -       -       smtpd
    587      inet  n       -       n       -       -       smtpd
    
    And now external emails are being delivered.

    Yeah.
     
    Last edited: Mar 22, 2017
  3. roller24

    roller24 New Member

    I am having this same issue, for several fresh installs using various tutorials. I always get everything to function except receiving emails from other servers.
    My email within the network is functioning perfectly.
    My ISP (comcast) blocks 25, so I have used the Server Config/Mail area to establish a relay using smtp.comcast.net:587 and my credentials to use the service.
    This enables sending to external servers perfect.

    No errors are seen in the mail log. and an attempt DAMEON MAILSERVER blah blah appears at the sending server stating several attempts were made.. not able to connect.

    I unblocked all ports on router, set up the server as DMZ.
    I attempted the solution here, and some others in the forums, with no luck as of yet

    Here is some 411 to help any who can assist.

    Code:
    root@server:/var/log# service postfix status
    ● postfix.service - LSB: Postfix Mail Transport Agent
       Loaded: loaded (/etc/init.d/postfix)
      Drop-In: /run/systemd/generator/postfix.service.d
               └─50-postfix-$mail-transport-agent.conf
       Active: active (running) since Tue 2017-06-20 13:26:27 EDT; 36s ago
      Process: 18131 ExecStop=/etc/init.d/postfix stop (code=exited, status=0/SUCCESS)
      Process: 15916 ExecReload=/etc/init.d/postfix reload (code=exited, status=0/SUCCESS)
      Process: 18159 ExecStart=/etc/init.d/postfix start (code=exited, status=0/SUCCESS)
       CGroup: /system.slice/postfix.service
               ├─18278 /usr/lib/postfix/master
               ├─18279 pickup -l -t unix -u -c
               └─18280 qmgr -l -t unix -u
    
    Jun 20 13:26:27 server postfix[18159]: Starting Postfix Mail Transport Agent: postfix.
    Jun 20 13:26:27 server systemd[1]: Started LSB: Postfix Mail Transport Agent.
    Jun 20 13:26:27 server postfix/master[18278]: daemon started -- version 2.11.3, configuration /etc/postfix
    root@server:/var/log#
    
    MASTER CF
    Code:
    root@server:/var/log# cat /etc/postfix/master.cf
    #
    # 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
    587      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=DRhu 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
            -o smtp_bind_address=
    
    
    127.0.0.1:10025 inet n - 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
            -o smtp_send_xforward_command=yes
            -o disable_dns_lookups=yes
    
    
    127.0.0.1:10027 inet n - 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
            -o smtp_send_xforward_command=yes
            -o milter_default_action=accept
            -o milter_macro_daemon_name=ORIGINATING
            -o disable_dns_lookups=yes
    
    root@server:/var/log#
    
     
  4. roller24

    roller24 New Member

    MAIN CF
    Code:
    root@server:/var/log# cat /etc/postfix/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 (Debian/GNU)
    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 = /usr/share/doc/postfix
    
    # TLS parameters
    smtpd_tls_cert_file = /etc/postfix/smtpd.cert
    smtpd_tls_key_file = /etc/postfix/smtpd.key
    smtpd_use_tls = yes
    smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
    smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
    
    # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
    # information on enabling SSL in the smtp client.
    
    smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
    myhostname = server.HOSTINGSERVER.com
    alias_maps = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
    alias_database = hash:/etc/aliases, hash:/var/lib/mailman/data/aliases
    myorigin = /etc/mailname
    mydestination = server.HOSTINGSERVER.com, localhost, localhost.localdomain
    relayhost = smtp.comcast.net:587
    mynetworks = 127.0.0.0/8 [::1]/128
    mailbox_command = procmail -a "$EXTENSION"
    mailbox_size_limit = 0
    recipient_delimiter = +
    inet_interfaces = all
    html_directory = /usr/share/doc/postfix/html
    virtual_alias_domains =
    virtual_alias_maps = hash:/var/lib/mailman/data/virtual-mailman, proxy:mysql:/etc/postfix/mysql-virtual_forwardings.cf, proxy:mysql:/etc/postfix/mysql-virtual_email2email.cf
    virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql-virtual_domains.cf
    virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
    virtual_mailbox_base = /var/vmail
    virtual_uid_maps = mysql:/etc/postfix/mysql-virtual_uids.cf
    virtual_gid_maps = mysql:/etc/postfix/mysql-virtual_gids.cf
    sender_bcc_maps = proxy:mysql:/etc/postfix/mysql-virtual_outgoing_bcc.cf
    inet_protocols = all
    smtpd_sasl_auth_enable = yes
    broken_sasl_auth_clients = yes
    smtpd_sasl_authenticated_header = yes
    smtpd_restriction_classes = greylisting
    greylisting = check_policy_service inet:127.0.0.1:10023
    smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf, reject_rbl_client zen.spamhaus.org, check_recipient_access mysql:/etc/postfix/mysql-virtual_policy_greylist.cf
    smtpd_tls_security_level = may
    transport_maps = hash:/var/lib/mailman/data/transport-mailman, proxy:mysql:/etc/postfix/mysql-virtual_transports.cf
    relay_domains = mysql:/etc/postfix/mysql-virtual_relaydomains.cf
    relay_recipient_maps = mysql:/etc/postfix/mysql-virtual_relayrecipientmaps.cf
    smtpd_sender_login_maps = proxy:mysql:/etc/postfix/mysql-virtual_sender_login_maps.cf
    proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps $virtual_alias_domains $sender_bcc_maps $virtual_mailbox_maps $virtual_mailbox_domains $relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps $recipient_canonical_maps $relocated_maps $transport_maps $mynetworks $smtpd_sender_login_maps
    smtpd_helo_required = yes
    smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, check_helo_access regexp:/etc/postfix/helo_access, reject_invalid_hostname, reject_non_fqdn_hostname, reject_invalid_helo_hostname, reject_unknown_helo_hostname, check_helo_access regexp:/etc/postfix/blacklist_helo
    smtpd_sender_restrictions = check_sender_access regexp:/etc/postfix/tag_as_originating.re , permit_mynetworks, permit_sasl_authenticated, check_sender_access mysql:/etc/postfix/mysql-virtual_sender.cf, check_sender_access regexp:/etc/postfix/tag_as_foreign.re
    smtpd_client_restrictions = check_client_access mysql:/etc/postfix/mysql-virtual_client.cf
    smtpd_client_message_rate_limit = 100
    maildrop_destination_concurrency_limit = 1
    maildrop_destination_recipient_limit = 1
    virtual_transport = dovecot
    header_checks = regexp:/etc/postfix/header_checks
    mime_header_checks = regexp:/etc/postfix/mime_header_checks
    nested_header_checks = regexp:/etc/postfix/nested_header_checks
    body_checks = regexp:/etc/postfix/body_checks
    owner_request_special = no
    smtp_tls_security_level = may
    smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
    smtpd_tls_protocols = !SSLv2,!SSLv3
    smtp_tls_protocols = !SSLv2,!SSLv3
    smtpd_tls_exclude_ciphers = RC4, aNULL
    smtp_tls_exclude_ciphers = RC4, aNULL
    dovecot_destination_recipient_limit = 1
    smtpd_sasl_type = dovecot
    smtpd_sasl_path = private/auth
    content_filter = amavis:[127.0.0.1]:10024
    receive_override_options = no_address_mappings
    message_size_limit = 0
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
    smtp_sasl_security_options = 
    DOVECOT CONF
    Code:
    root@server:/var/log# cat /etc/dovecot/dovecot.conf
    listen = *,[::]
    protocols = imap pop3
    auth_mechanisms = plain login
    disable_plaintext_auth = no
    log_timestamp = "%Y-%m-%d %H:%M:%S "
    mail_privileged_group = vmail
    ssl_cert = </etc/postfix/smtpd.cert
    ssl_key = </etc/postfix/smtpd.key
    ssl_protocols = !SSLv3
    mail_max_userip_connections = 100
    passdb {
      args = /etc/dovecot/dovecot-sql.conf
      driver = sql
    }
    userdb {
      driver = prefetch
    }
    userdb {
      args = /etc/dovecot/dovecot-sql.conf
      driver = sql
    }
    plugin {
      quota = dict:user::file:/var/vmail/%d/%n/.quotausage
      sieve=/var/vmail/%d/%n/.sieve
      sieve_max_redirects = 25
    }
    service auth {
      unix_listener /var/spool/postfix/private/auth {
        group = postfix
        mode = 0660
        user = postfix
      }
      unix_listener auth-userdb {
        group = vmail
        mode = 0600
        user = vmail
      }
      user = root
    }
    service lmtp {
      unix_listener /var/spool/postfix/private/dovecot-lmtp {
       group = postfix
       mode = 0600
       user = postfix
       # For higher volume sites, it may be desirable to increase the number of active listener processes.
       # A range of 5 to 20 is probably good for most sites
    #   process_min_avail = 5
      }
    }
    service imap-login {
      client_limit = 1000
      process_limit = 512
    }
    protocol imap {
      mail_plugins = quota imap_quota
    }
    protocol pop3 {
      pop3_uidl_format = %08Xu%08Xv
      mail_plugins = quota
    }
    protocol lda {
    postmaster_address = postmaster@server.HOSTINGSERVER.com
      mail_plugins = sieve quota
    }
    protocol lmtp {
    postmaster_address = postmaster@server.HOSTINGSERVER.com
      mail_plugins = quota sieve
    }
    root@server:/var/log#
    
     
  5. roller24

    roller24 New Member

    IPTABLES
    Code:
    iptables -S (ipv4)
    -P INPUT ACCEPT
    -P FORWARD ACCEPT
    -P OUTPUT ACCEPT
    -N fail2ban-dovecot-pop3imap
    -N fail2ban-postfix-sasl
    -N fail2ban-pureftpd
    -N fail2ban-ssh
    -A INPUT -p tcp -m multiport --dports 25 -j fail2ban-postfix-sasl
    -A INPUT -p tcp -m multiport --dports 110,995,143,993 -j fail2ban-dovecot-pop3imap
    -A INPUT -p tcp -m multiport --dports 21 -j fail2ban-pureftpd
    -A INPUT -p tcp -m multiport --dports 22 -j fail2ban-ssh
    -A fail2ban-dovecot-pop3imap -j RETURN
    -A fail2ban-postfix-sasl -j RETURN
    -A fail2ban-pureftpd -j RETURN
    -A fail2ban-ssh -j RETURN
    
    ip6tables -S (ipv6)
    -P INPUT ACCEPT
    -P FORWARD ACCEPT
    -P OUTPUT ACCEPT
    
    Tutorial USED
    Debian 8.6 inginx, postfix, dovecot, removed roundcube, using squirrel due to nagging config.php not found error which reoccurs on roundcube after using ISPC to edit configuration.
     
  6. Jesse Norell

    Jesse Norell Well-Known Member

    If Comcast blocks port 25, I'd guess they probably block it in both directions, which would explain why inbound connections to your port 25 are failing.
     
  7. roller24

    roller24 New Member

    Is there a workaround using an alternate port?
     
  8. Jesse Norell

    Jesse Norell Well-Known Member

    For outgoing mail you can do just what you did (relay through another mail server/service). For incoming, no, you can't use another port. You could probably find/use another mail service and have them deliver to your server on an alternate port, but it may defeat some of your purpose for having a server (or it may not, eg. there are spam scanning services where mail delivers to them and they forward to you).
     
  9. roller24

    roller24 New Member

    :oops: Thanks Jesse.....Any relation the the Norell family in Long Island? My Son's girl is a Norell
     
  10. Jesse Norell

    Jesse Norell Well-Known Member

    I don't believe so
     

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