Problems setting up sendmail in Centos

I'm trying to set up sendmail, but something wrong happens, sendmail shut down itself, or something is shutting down, because every time I run sendmail, some minutes later, it shutdown.

Any ideas?
CloudHelpdeskOneAsked:
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CloudHelpdeskOneAuthor Commented:
I run sendmail with this command:

# /etc/init.d/sendmail start
Starting sendmail:                                         [  OK  ]
Starting sm-client:                                        [  OK  ]


Then to check if the sendmail is working I execute the netstat command:

# netstat -pant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:993                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:995                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:20007               0.0.0.0:*                   LISTEN      1317/perl
tcp        0      0 0.0.0.0:587                 0.0.0.0:*                   LISTEN      18556/sendmail
tcp        0      0 0.0.0.0:110                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:143                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1215/sshd
tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      18556/sendmail
tcp        0      0 0.0.0.0:26                  0.0.0.0:*                   LISTEN      18556/sendmail
tcp        0   1296 66.235.180.100:22           201.153.61.107:50551        ESTABLISHED 16007/sshd
tcp        0     48 66.235.180.100:22           201.153.61.107:50552        ESTABLISHED 16138/sshd
tcp        0      0 127.0.0.1:25                127.0.0.1:51030             ESTABLISHED -
tcp        0      0 :::993                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::995                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::110                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::143                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::22                       :::*                        LISTEN      1215/sshd
tcp        0      0 ::ffff:127.0.0.1:51030      ::ffff:127.0.0.1:25         ESTABLISHED 18565/sendmail: ./t

But about 3 minutes later, the sendmail disappears from list of programs that are listening ports, like this example:

# netstat -pant
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 0.0.0.0:993                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:995                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:20007               0.0.0.0:*                   LISTEN      1317/perl
tcp        0      0 0.0.0.0:110                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:143                 0.0.0.0:*                   LISTEN      1223/dovecot
tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      1215/sshd
tcp        0      0 66.235.180.100:22           201.153.61.107:50551        ESTABLISHED 16007/sshd
tcp        0     48 66.235.180.100:22           201.153.61.107:50552        ESTABLISHED 16138/sshd
tcp        0      0 :::993                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::995                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::110                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::143                      :::*                        LISTEN      1223/dovecot
tcp        0      0 :::22                       :::*                        LISTEN      1215/sshd

I don't know why sendmail disappears. But when I execute ps -aux the sendmail appears in the list like this:

# ps -aux | grep sendmail
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
smmsp    18564  0.0  0.1  12584  1712 ?        Ss   02:16   0:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue
root     18622  0.0  0.0   4356   720 pts/1    S+   02:22   0:00 grep sendmail


Any idea?
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savoneCommented:
check the logs.

What distro of Linux are you using?

Check /var/log/messages

and

/var/log/maillog
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arnoldCommented:
The sendmail configuration seems to only handle queue processing versus running as a daemon.

Do you gave web in I stalked, IMHO, using postfix as the mail server might be simpler to manage, you can still gave dovecote serve as the IMAP, pop .........access to email.
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arnoldCommented:
Look you have sendmail bound/listening on port 25 for incoming requests.
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Jan SpringerCommented:
cat /etc/mail/sendmail.mc
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CloudHelpdeskOneAuthor Commented:
This is cat /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 #     /etc/mail/make
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 #
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 #
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')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 # Configuracion del certificado SSL
define(`confCACERT_PATH',`/etc/mail/ssl/certs')
define(`confCACERT',`/etc/mail/ssl/certs/ca-bundle.crt')
define(`confSERVER_CERT',`/etc/mail/ssl/certs/sendmail.pem')
define(`confSERVER_KEY',`/etc/mail/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 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 #
define(`confMAX_DAEMON_CHILDREN', `24')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 #
define(`confCONNECTION_RATE_THROTTLE', `5')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 # Configuracion experimental para limitar el tamaño de los correos
dnl # que se pueden aceptar y deshabilitar las notificaciones de recepcion
define(`confMAX_MESSAGE_SIZE', `22504000')dnl
dnl # define(`confMAX_MESSAGE_SIZE', `19456000')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 #
dnl # DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
DAEMON_OPTIONS(`Port=26, Name=MTA')dnl
DAEMON_OPTIONS(`Port=587, 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 #
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 #
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(`sm6.panngea.net')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
MASQUERADE_EXCEPTION(`nodotv.com')dnl
dnl FEATURE(dnsbl, `blackholes.mail-abuse.org', `Rejected - see www.mail-abuse.org/rbl/')dnl
dnl FEATURE(dnsbl, `dialups.mail-abuse.org', `Rejected - see www.mail-abuse.org/dul/')dnl
dnl FEATURE(dnsbl, `relays.mail-abuse.org', `Rejected - see work-rss.mail-abuse.org/rss/')dnl
FEATURE(dnsbl, `sbl-xbl.spamhaus.org', `Rejected - see http://www.spamhaus.org/SBL/')dnl
dnl FEATURE(dnsbl, `bl.spamcop.net', `Rejected - see http://spamcop.net/')dnl
MAILER(smtp)dnl
MAILER(procmail)dnl
dnl MAILER(cyrusv2)dnl
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CloudHelpdeskOneAuthor Commented:
The server is CENTOS LINUX 6.5

 /var/log/messages -> has not registries associated with the problem, these are the last lines:

Sep 27 03:24:01 sm6 rsyslogd: [origin software="rsyslogd" swVersion="5.8.10" x-pid="1059" x-info="http://www.rsyslog.com"] rsyslogd was HUPed
Sep 27 08:52:08 sm6 auditd[1043]: Audit daemon rotating log files
Oct  2 00:39:27 sm6 yum[13823]: Installed: sendmail-8.14.4-9.el6.i686
Oct  2 00:39:29 sm6 yum[13823]: Installed: sendmail-cf-8.14.4-9.el6.noarch
Oct  2 00:40:48 sm6 yum[13893]: Installed: sendmail-doc-8.14.4-9.el6.noarch


The other log file /var/log/maillog  has the following:

Oct  2 01:41:33 sm6 sendmail[14813]: starting daemon (8.14.4): SMTP+queueing@01:00:00
Oct  2 01:41:33 sm6 sendmail[14813]: STARTTLS=server: file /etc/mail/ssl/certs/sendmail.pem unsafe: No such file or directory
Oct  2 01:41:33 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot listen: Address already in use
Oct  2 01:41:33 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:41:34 sm6 sm-msp-queue[14821]: starting daemon (8.14.4): queueing@01:00:00
Oct  2 01:41:38 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:41:38 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:41:43 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:41:43 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:41:48 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:41:48 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:41:53 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:41:53 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:41:58 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:41:58 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:03 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:42:03 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:08 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:42:08 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:13 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:42:13 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:18 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:42:18 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:23 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: cannot bind: Address already in use
Oct  2 01:42:23 sm6 sendmail[14813]: daemon MSA: problem creating SMTP socket
Oct  2 01:42:23 sm6 sendmail[14813]: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MSA: server SMTP socket wedged: exiting
Oct  2 01:42:23 sm6 sm-msp-queue[14822]: t8U8GwvH018083: to=postmaster, delay=1+21:25:25, xdelay=00:00:49, mailer=relay, pri=4263170, relay=[127.0.0.1] [127.0.0.1], dsn=4.0.0, stat=Deferred: Connection reset by [127.0.0.1]
Oct  2 01:42:24 sm6 sm-msp-queue[14822]: t8U8GwvI018083: to=postmaster, delay=1+21:25:26, xdelay=00:00:00, mailer=relay, pri=4263187, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection reset by [127.0.0.1]
Oct  2 01:42:24 sm6 sm-msp-queue[14822]: t8U4GwvI015328: to=heber, delay=2+01:25:26, xdelay=00:00:00, mailer=relay, pri=4621532, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection reset by [127.0.0.1]
Oct  2 01:42:24 sm6 sm-msp-queue[14822]: t8U4GwvH015328: to=heber, delay=2+01:25:26, xdelay=00:00:00, mailer=relay, pri=4621549, relay=[127.0.0.1], dsn=4.0.0, stat=Deferred: Connection reset by [127.0.0.1]


At this point i need to metion that i stop sendmail and then I start sendmail, so in these entries you can see when I sendmail is starting, and some seconds later the deamon crash, I guess it crashes  after the sendmail tried to send two messages, one from postmaster and one from a test user called heber.

Do you have any idea what I did wrong?

Thank you for your help.
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arnoldCommented:
Oct  2 01:41:33 sm6 sendmail[14813]: starting daemon (8.14.4): SMTP+queueing@01:00:00
Oct  2 01:41:33 sm6 sendmail[14813]: STARTTLS=server: file /etc/mail/ssl/certs/sendmail.pem unsafe: No such file or directory
Oct  2 01:41:33 sm6 sendm
Look at the config, you seem to have enabled starttls as an available option, without creating a certificate.

Disable that option.
Run lsof -I:25
This will help determine whether port 25 is the issue, look at sendmail.mc daemon_options you may gave other ports for sendmail to bind to that is the issue...
I.e. 465, 587, ......
Is sendmail a must or any mail server will do?
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SandyCommented:
check /etc/sysconfig/sendmail

DAEMON=yes  (should be there)

Ty/SA
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CloudHelpdeskOneAuthor Commented:
I checked /etc/sysconfig/sendmail

and this is the content:

DAEMON=yes
QUEUE=1h

Any other suggestion?
Is it possible tha is a dovecot issue?
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arnoldCommented:
Unfortunately, you are providing some obscure pieces to a 20 piece puzzle asking whether I can tell you what the picture is.

First issue, is that your sendmail.mc and when sendmail starts indicates that there is an issue.
your sendmail.mc tells it to bind to IPv4,IPv6 and IPV6 local

the conflict might be that your sendmail.mc is telling it to bind to smtps (465) and this is the port that dovecot might also be configured to bind.

try
lsof -i:25  #smtp
lsof -i:465 #secure smtps
lsof -i:587 #off port SMTP usually used for unencrypted outgoing port
lsof -i:993  #secure IMAP port
lsof -i:143 #IMAP Port
lsof -i:110 #POP3 Port
lsof -i:995 #secure POP3 port

I think that covers the various ports likely port 465 is the overlap. i.e. disable dovecot when you start sendmail and run the above. Then stop sendmail and rerun the above.
if you have response on both sides, that is the port at issue.


Is sendmail a required mail server, there are other replacement that are simpler to manage and are modular, consider postfix.org.
Nothing changes on your coding/...end the /usr/sbin/sendmail is a place holder that will reference the installed and MTA and will function as intended.
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CloudHelpdeskOneAuthor Commented:
I found my problem, the problem was that I have a misconfiguration in these lines:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
DAEMON_OPTIONS(`Port=26, Name=MTA')dnl
DAEMON_OPTIONS(`Port=587, Name=MTA')dnl

I commented the last two lines:

DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
dnl # DAEMON_OPTIONS(`Port=26, Name=MTA')dnl
dnl # DAEMON_OPTIONS(`Port=587, Name=MTA')dnl

So the problem was fixed.

Thank you everbody for your help

Regards
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CloudHelpdeskOneAuthor Commented:
Thank you for your comments, were useful to me to resolve the problem
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