 | | | Notifications email failure | Notifications email failure 2005-08-29 - By Jeff Boyce
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-- -- Original Message -- --
From: "Thomas Cameron" <thomas.cameron@(protected)>
To: "Jeff Boyce" <jboyce@(protected)>; "Discussion of Red Hat Enterprise
Linux 3 (Taroon)" <taroon-list@(protected)>
Sent: Monday, August 29, 2005 2:58 PM
Subject: Re: Notifications email failure
>> Greetings -
>>
>> I am a novice network manager for a small office network running a RHEL 3
>> server on a Dell PE2600. The server is used primarily as a Samba server
>> for
>> about 10 Windows clients. It is not used as a mail server or web server
>> (our mail is delivered via POP3 from a 3rd party provider). I am aware
>> that
>> several of the administrative programs (e.g., tape backup, Dell OMSA, UPS
>> battery management tool, etc.) on my server send email notifications to
>> root
>> when conditional events occur. I have root's email set up to be
>> redirected
>> to my email address, yet since I have not received any emails I am
>> assuming
>> that I don't have something properly configured. I generally have most
>> services turned off that are not necessary for our local network. The
>> maillog
>> file indicates that it is unable to resolve where the email is to be
>> sent.
>> When I
>> check running processes on our server it shows that Named is currently
>> running, but checking the BindDNS service through Webmin gives the
>> following
>> message.
>>
>> The primary configuration file for BIND /var/named/chroot/etc/named.conf
>> does not exist, or is not valid. Create it?
>>
>> Below are the messages from the /var/log/maillog file indicating the
>> attempts to send the email notifications.
>>
>> Aug 17 01:38:01 bison sendmail[20314]: My unqualified host name (bison)
>> unknown; sleeping for retry
>>
>> Aug 17 01:39:01 bison sendmail[20314]: unable to qualify my own domain
>> name
>> (bison) -- using short name
>>
>> Aug 17 01:39:02 bison sendmail[20314]: j7H8d1XK020314: from=root,
>> size=1337,
>> class=0, nrcpts=1, msgid=<200508170839.j7H8d1XK020314@(protected)>,
>> relay=root@(protected)
>>
>> Aug 17 01:39:02 bison sendmail[20314]: j7H8d1XK020314:
>> to=jboyce@(protected), ctladdr=root (0/0), delay=00:00:01,
>> xdelay=00:00:00, mailer=relay, pri=31337, relay=[127.0.0.1] [127.0.0.1],
>> dsn=4.0.0, stat=Deferred: Connection refused by [127.0.0.1]
>>
>> Aug 17 04:02:03 bison sendmail[20584]: My unqualified host name (bison)
>> unknown; sleeping for retry
>>
>> Aug 17 04:03:03 bison sendmail[20584]: unable to qualify my own domain
>> name
>> (bison) -- using short name
>>
>> Aug 17 04:03:03 bison sendmail[20584]: j7HB33cm020584: from=root,
>> size=5002,
>> class=0, nrcpts=1, msgid=<200508171103.j7HB33cm020584@(protected)>,
>> relay=root@(protected)
>>
>> Aug 17 04:03:03 bison sendmail[20584]: j7HB33cm020584: to=root,
>> ctladdr=root
>> (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=35002,
>> relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection
>> refused
>> by [127.0.0.1]
>>
>> My /etc/hosts file shows the following information. Workstations 105 and
>> 100 are listed for proper operation of a network tape backup.
>>
>> 127.0.0.1 localhost.localdomain localhost
>> 192.168.112.1 bison
>> 192.168.112.105 jeff
>> 192.168.112.100 pamk
>>
>> I am assuming that there is probably a simple solution to this problem,
>> but
>> I am not sure how to interpret the maillog messages. What additional
>> configuration changes do I need to make to receive the notification
>> emails?
>
> Sounds like your sendmail config is set to reject mail from hosts whose
> names do not resolve in DNS (i.e. www.example.com). You machine's name
> (bison) does not resolve in DNS.
>
> What does your /etc/mail/sendmail.mc look like?
>
> Thomas
>
>
Thanks for the response. I was ready to believe that this was lost in the
unanswered questions blackhole. My sendmail.mc file is listed below. Sorry
it is a little long as I didn't take out the comment lines (at least I
remembered to bottom post). What confused me on the log entries is that I
don't have the sendmail service running, yet the log entry indicates that it
is at least responding internally.
/etc/mail/sendmail.mc
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 Red Hat Linux')dnl
OSTYPE(`linux')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 #
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 #
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 # make -C /usr/share/ssl/certs usage
dnl # or use the included makecert.sh script
dnl #
dnl define(`confCACERT_PATH',`/usr/share/ssl/certs')
dnl define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt')
dnl define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem')
dnl define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem')
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 -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 # 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 @(protected), 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
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