Sendmail to local domain ignoring MX records

Discussion in 'Installation/Configuration' started by FractalizeR, Jan 14, 2010.

  1. FractalizeR

    FractalizeR New Member


    I have the exact problem, like in this post: I am also using email provider like GMail For Your Domain (which stores your mail and manages it). I am sending mail from my server directly, but receiving mail is done via Yandex (email provider). Since the server hosts forum, I prefer to send mail directly from it because using another mail provider can slow things. Also, when I send 300.000 emails to my subscribers, email provider will surely block me thinking I send spam.

    My DNS zone now is:

        ; GSMFORUM.RU
        $TTL 1H
        SOA (
                       2009122268 ; Serial
                       1H         ; Refresh
                       30M        ; Retry
                       1W         ; Expire
                       1H       ) ; Minimum
                                NS          NS
        @                     A
        *        CNAME   @
        ns1                   A
        ns2                   A
        @                     MX      10
        mail                  CNAME
        yamail-xxxxxxxxx      CNAME

    Server hostname is May be this is the cause? Can someone explain the reason of the matter (the rules that make sendmail consider domain to be local)? Can I easily change
        *        CNAME   @

        *        A
    to solve this problem?
        [root@server ~]# cat /etc/mail/local-host-names
    This server hosts so I cannot put it into another domain like David Mackintosh suggests. Putting domain in mailertable doesn't solve the problem also. sendmail -bt still shows, that address is local. DontProbeInterfaces is also set to true at sendmail config.

    M4 file follows:

        dnl #
        dnl # This is the sendmail macro config file for m4. If you make changes to
        dnl # /etc/mail/, you will need to regenerate the
        dnl # /etc/mail/ file by confirming that the sendmail-cf package is
        dnl # installed and then performing a
        dnl #
        dnl #     make -C /etc/mail
        dnl #
        VERSIONID(`setup for linux')dnl
        dnl #
        dnl # Do not advertize sendmail version.
        dnl #
        dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl
        dnl #
        dnl # default logging level is 9, you might want to set it higher to
        dnl # debug the configuration
        dnl #
        dnl define(`confLOG_LEVEL', `9')dnl
        dnl #
        dnl # Uncomment and edit the following line if your outgoing mail needs to
        dnl # be sent out through an external mail server:
        dnl #
        dnl define(`SMART_HOST', `smtp.your.provider')dnl
        dnl #
        define(`confDEF_USER_ID', ``8:12'')dnl
        dnl define(`confAUTO_REBUILD')dnl
        define(`confTO_CONNECT', `1m')dnl
        define(`confTRY_NULL_MX_LIST', `True')dnl
        define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl
        define(`ALIAS_FILE', `/etc/aliases')dnl
        define(`STATUS_FILE', `/var/log/mail/statistics')dnl
        define(`UUCP_MAILER_MAX', `2000000')dnl
        define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
        define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
        define(`confAUTH_OPTIONS', `A')dnl
        dnl #
        dnl # The following allows relaying if the user authenticates, and disallows
        dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links
        dnl #
        dnl define(`confAUTH_OPTIONS', `A p')dnl
        dnl # 
        dnl # PLAIN is the preferred plaintext authentication method and used by
        dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do
        dnl # use LOGIN. Other mechanisms should be used if the connection is not
        dnl # guaranteed secure.
        dnl # Please remember that saslauthd needs to be running for AUTH. 
        dnl #
        dnl #
        dnl # Rudimentary information on creating certificates for sendmail TLS:
        dnl #     cd /usr/share/ssl/certs; make sendmail.pem
        dnl # Complete usage:
        dnl #     make -C /usr/share/ssl/certs usage
        dnl #
        dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl
        dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl
        dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl
        dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl
        dnl #
        dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's
        dnl # slapd, which requires the file to be readble by group ldap
        dnl #
        dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl
        dnl #
        dnl define(`confTO_QUEUEWARN', `4h')dnl
        dnl define(`confTO_QUEUERETURN', `5d')dnl
        dnl define(`confQUEUE_LA', `12')dnl
        dnl define(`confREFUSE_LA', `18')dnl
        define(`confTO_IDENT', `0')dnl
        dnl FEATURE(delay_checks)dnl
        FEATURE(`no_default_msa', `dnl')dnl
        FEATURE(`smrsh', `/usr/sbin/smrsh')dnl
        FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl
        FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl
        dnl #
        dnl # The following limits the number of processes sendmail can fork to accept 
        dnl # incoming messages or process its message queues to 20.) sendmail refuses 
        dnl # to accept connections once it has reached its quota of child processes.
        dnl #
        dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl
        dnl #
        dnl # Limits the number of new connections per second. This caps the overhead 
        dnl # incurred due to forking new sendmail processes. May be useful against 
        dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP address 
        dnl # limit would be useful but is not available as an option at this writing.)
        dnl #
        dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl
        dnl #
        dnl # The -t option will retry delivery if e.g. the user runs over his quota.
        dnl #
        FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl
        FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl
        dnl #
        dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery uncomment
        dnl # the following 2 definitions and activate below in the MAILER section the
        dnl # cyrusv2 mailer.
        dnl #
        dnl define(`confLOCAL_MAILER', `cyrusv2')dnl
        dnl define(`CYRUSV2_MAILER_ARGS', `FILE /var/lib/imap/socket/lmtp')dnl
        dnl #
        dnl # The following causes sendmail to only listen on the IPv4 loopback address
        dnl # and not on any other network devices. Remove the loopback
        dnl # address restriction to accept email from the internet or intranet.
        dnl #
        dnl #
        dnl # The following causes sendmail to additionally listen to port 587 for
        dnl # mail from MUAs that authenticate. Roaming users who can't reach their
        dnl # preferred sendmail daemon due to port 25 being blocked or redirected find
        dnl # this useful.
        dnl #
        dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
        dnl #
        dnl # The following causes sendmail to additionally listen to port 465, but
        dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed
        dnl # by STARTTLS is preferred, but roaming clients using Outlook Express can't
        dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS
        dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps
        dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1.
        dnl #
        dnl # For this to work your OpenSSL certificates must be configured.
        dnl #
        dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
        dnl #
        dnl # The following causes sendmail to additionally listen on the IPv6 loopback
        dnl # device. Remove the loopback address restriction listen to the network.
        dnl #
        dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl
        dnl #
        dnl # enable both ipv6 and ipv4 in sendmail:
        dnl #
        dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6')
        dnl #
        dnl # We strongly recommend not accepting unresolvable domains if you want to
        dnl # protect yourself from spam. However, the laptop and users on computers
        dnl # that do not have 24x7 DNS do need this.
        dnl #
        dnl #
        dnl FEATURE(`relay_based_on_MX')dnl
        dnl # 
        dnl # Also accept email sent to "localhost.localdomain" as local email.
        dnl # 
        dnl #
        dnl # The following example makes mail from this host and any additional
        dnl # specified domains appear to be sent from
        dnl #
        dnl MASQUERADE_AS(`')dnl
        dnl #
        dnl # masquerade not just the headers, but the envelope as well
        dnl #
        dnl FEATURE(masquerade_envelope)dnl
        dnl #
        dnl # masquerade not just, but @* as well
        dnl #
        dnl FEATURE(masquerade_entire_domain)dnl
        dnl #
        dnl MASQUERADE_DOMAIN(localhost)dnl
        dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
        dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
        dnl MAILER(cyrusv2)dnl
        FEATURE(`dnsbl',`',`Rejected - your IP is blacklisted by')
  2. topdog

    topdog Active Member HowtoForge Supporter

    U can add the domain_name to /etc/mail/local-host-names and add an entry in /etc/hosts
  3. FractalizeR

    FractalizeR New Member

    What I am trying to do, is to make sendmail to send all outgoing mail to the server registered as MX for this domain. What good will adding to /etc/hosts and to local-host-names do?
  4. topdog

    topdog Active Member HowtoForge Supporter

    In that case then why do u want to change anything, send mail will lookup the MX record and deliver the mail to that host
  5. FractalizeR

    FractalizeR New Member

    Please read my question. sendmail detects MX domain is local. That is the problem.
  6. Flash

    Flash New Member

  7. FractalizeR

    FractalizeR New Member

    It is discussed at the link I gave. Anyway, I managed to solve the problem by putting local domain to the list of relayed and setting up redirection in /etc/mailertable

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