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Hi, I am running a CentOS server with Apache, PHP, ect. The name of the server is mycompany.com (hosts our company website). I am trying to use sendmail to send ...
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  1. #1
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    Sendmail question


    Hi,

    I am running a CentOS server with Apache, PHP, ect. The name of the server is mycompany.com (hosts our company website). I am trying to use sendmail to send myself an email (me at mycompany dot com) and it comes back with a 550 5.1.1 ... User Unknown.

    I believe it thinks that my email address is a local user on the server and it fails. How would I set up correct routing to have it send me an email to my exchange server?

  2. #2
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    how are you using the sendmail command ? And do you have a mail server ? are you using it to send mail ?

  3. #3
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    The program "sendmail" is a mailserver (older than Exchange) and not a mail transport program.

  4. #4
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    Please send files over

    Please send the following files:

    sendmail.mc

    I would like to see how you have it configured, be sure to remove the ip address information for security purposes.

    In addition, there are other files under /etc/mail

    Please send all of those files as well, need to see if you have made any changes.

    One thing to note, the person asked a question, how did you send the email, for example:

    echo testing | mail -s 'This is just a test' person@domain.com

    Please advise.

    Tdsan

  5. #5
    Linux Enthusiast Mudgen's Avatar
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    Quote Originally Posted by alf55 View Post
    The program "sendmail" is a mailserver (older than Exchange) and not a mail transport program.
    A Mail Transport Agent (MTA) is exactly what sendmail is, primarily. It also provides the command line transmission features of a Mail User Agent (MUA).

    Since the OP's server name is mycompany.com, then yes, it would absolutely regard any @mycompany.com address as local by default. Various ways to solve, depending on whether _any_ mail needs to be delivered locally on the server or not.

  6. #6
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    I use: mail -v my@mycompany.com

    I am able to send to gmail or hotmail just fine. I don't need to set it up to accept mail, simply to send. Any helpful hints would be great!

    Here is my sendmail.mc file:


    divert(-1)dnl
    dnl #
    dnl # This is the sendmail macro config file for m4. If you make changes to
    dnl # /etc/mail/sendmail.mc, you will need to regenerate the
    dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf package is
    dnl # installed and then performing a
    dnl #
    dnl # make -C /etc/mail
    dnl #
    include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
    VERSIONID(`setup for linux')dnl
    OSTYPE(`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(`confDONT_PROBE_INTERFACES', `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 TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
    dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
    dnl #
    dnl # Rudimentary information on creating certificates for sendmail TLS:
    dnl # cd /etc/pki/tls/certs; make sendmail.pem
    dnl # Complete usage:
    dnl # make -C /etc/pki/tls/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
    FEATURE(redirect)dnl
    FEATURE(always_add_domain)dnl
    FEATURE(use_cw_file)dnl
    FEATURE(use_ct_file)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
    FEATURE(`blacklist_recipients')dnl
    EXPOSED_USER(`root')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 # 127.0.0.1 and not on any other network devices. Remove the loopback
    dnl # address restriction to accept email from the internet or intranet.
    dnl #
    DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')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 #
    FEATURE(`accept_unresolvable_domains')dnl
    dnl #
    dnl FEATURE(`relay_based_on_MX')dnl
    dnl #
    dnl # Also accept email sent to "localhost.localdomain" as local email.
    dnl #
    LOCAL_DOMAIN(`localhost.localdomain')dnl
    dnl #
    dnl # The following example makes mail from this host and any additional
    dnl # specified domains appear to be sent from mydomain.com
    dnl #
    dnl MASQUERADE_AS(`mydomain.com')dnl
    dnl #
    dnl # masquerade not just the headers, but the envelope as well
    dnl #
    dnl FEATURE(masquerade_envelope)dnl
    dnl #
    dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as well
    dnl #
    dnl FEATURE(masquerade_entire_domain)dnl
    dnl #
    dnl MASQUERADE_DOMAIN(localhost)dnl
    dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
    dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
    dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
    MAILER(smtp)dnl
    MAILER(procmail)dnl
    dnl MAILER(cyrusv2)dnl

    I haven't edited this file in any way, shape, or form (obviously).

  7. #7
    Linux Enthusiast Mudgen's Avatar
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    Based on what you've said, I think that what's happening is that because the server's name is mycompany.com, mail for user@mycompany.com gets the domain stripped when running through the rewrite rules and thus local delivery is attempted. Should be able to solve with an entry in /etc/mail/mailertable (since that's enabled):

    mycompany.com esmtp:[exchange.mycompany.com]

    The white space should be a tab. Obviously, your exchange server's name goes in the square brackets. I think it can also be the IP.

    Restarting sendmail will rebuild the map, or you can
    cd /etc/mail;makemap hash mailertable < mailertable

    Note that if any mail does get sent to, say, root@mycompany.com on the server, it will attempt to relay it via exchange.

  8. #8
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    Hi Mudgen,

    Thank you for your help. I tried to edit the mailertable using bothmy exchange server name and the IP address and I'm still getting the same error:

    ----- The following addresses had permanent fatal errors -----
    kit.day@myserver.com
    (reason: 550 5.1.1 <kit.day@myserver.com>... User unknown)
    (expanded from: kit.day@myserver.com)

    ----- Transcript of session follows -----
    ... while talking to [127.0.0.1]:
    >>> DATA
    <<< 550 5.1.1 <kit.day@myserver.com>... User unknown
    550 5.1.1 kit.day@myserver.com... User unknown
    <<< 503 5.0.0 Need RCPT (recipient)

    --p7OKZNSp017687.1314218123/myserver.com
    Content-Type: message/delivery-status

    Unfortunately it still is trying to send it to a local account on the server. Any other suggestions?

  9. #9
    Linux Enthusiast Mudgen's Avatar
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    Check to make sure the mailertable.db map got rebuilt from the text file you edited. If you restarted sendmail or did the makemap command (from /etc/mail), that should have happened, but check the date stamp.

    I believe your problem is stemming from the server having the hostname myserver.com, which I've never done. When the domain name just has a DNS record pointing to the server, the mailertable entry will take care of it, but that may not be the case with the server thinking that's its own actual name. I've always given the server a unique name and just put in a DNS entry pointing to it to handle the URL. Is it possible for you to do that?
    onearmedman85 likes this.

  10. #10
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    That did the trick! I had thought about changing my hostname earlier, but I wanted to see if I could figure out the routing rules. Guess I should have taken the easy way out earlier.

    Thanks again!

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