HI,<br><br><br> Check the below things on your server.<br><br><br>1) diskspace <br><br>2) mailq<br><br>3) netstat -ntlp |grep :25 |grep tcp<br><br>4) telnet on port 25 from server as well as from client<br><br>5) ps auxxww |grep sendmail<br>
<br>################you should get output like below###########################<br>root 794 0.0 0.0 4320 648 pts/2 S+ 13:13 0:00 grep sendmail<br>root 21186 0.0 0.2 10876 2156 ? Ss May23 0:00 sendmail: accepting connections<br>
smmsp 21195 0.0 0.1 8192 1636 ? Ss May23 0:00 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue<br>########################################################################<br><br>5) check maillog properly definitely it will throw some messages<br>
<br>6) check /var/log/messages .<br><br><br><br> Check the maillog otherwise increase the sendmail loglevel in the <a href="http://sendmail.mc">sendmail.mc</a> file to 10 and restart sendmail.<br><br><br><br><br><br>Line to be changed in <a href="http://sendmail.mc">sendmail.mc</a> to increase log level.<br>
<br>dnl define(`confLOG_LEVEL', `9')dnl<br><br><br><br>Regards<br>lingu<br><br><div class="gmail_quote">On Mon, Jun 9, 2008 at 6:33 PM, Ray Leventhal <<a href="mailto:centos@swhi.net">centos@swhi.net</a>> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">HI folks,<br>
<br>
I've an up-to-date CentOS 5.x box on a small intranet (<20 users).<br>
<br>
We did a reboot over the weekend and all appears well except that clients on the LAN can no longer send email. Just hangs/times out. No clear identifiers in the /var/log/maillog or /var/log/messages.<br>
<br>
We're not setup for ESMTP as it's a closed network and I'm really hoping for a kickstart as to where to look to get this going.<br>
<br>
In case it helps, my <a href="http://sendmail.cf" target="_blank">sendmail.cf</a> file is below.<br>
<br>
Thanks in advance.<br>
-R<br>
<br>
divert(-1)dnl<br>
dnl #<br>
dnl # This is the sendmail macro config file for m4. If you make changes to<br>
dnl # /etc/mail/<a href="http://sendmail.mc" target="_blank">sendmail.mc</a>, you will need to regenerate the<br>
dnl # /etc/mail/<a href="http://sendmail.cf" target="_blank">sendmail.cf</a> file by confirming that the sendmail-cf package is<br>
dnl # installed and then performing a<br>
dnl #<br>
dnl # make -C /etc/mail<br>
dnl #<br>
include(`/usr/share/sendmail-cf/m4/cf.m4')dnl<br>
VERSIONID(`setup for linux')dnl<br>
OSTYPE(`linux')dnl<br>
dnl #<br>
dnl # Do not advertize sendmail version.<br>
dnl #<br>
dnl define(`confSMTP_LOGIN_MSG', `$j Sendmail; $b')dnl<br>
dnl #<br>
dnl # default logging level is 9, you might want to set it higher to<br>
dnl # debug the configuration<br>
dnl #<br>
dnl define(`confLOG_LEVEL', `9')dnl<br>
dnl #<br>
dnl # Uncomment and edit the following line if your outgoing mail needs to<br>
dnl # be sent out through an external mail server:<br>
dnl #<br>
dnl # define(`SMART_HOST', `smtp.your.provider')dnl<br>
dnl #<br>
define(`confDEF_USER_ID', ``8:12'')dnl<br>
dnl define(`confAUTO_REBUILD')dnl<br>
define(`confTO_CONNECT', `1m')dnl<br>
define(`confTRY_NULL_MX_LIST', `True')dnl<br>
define(`confDONT_PROBE_INTERFACES', `True')dnl<br>
define(`PROCMAIL_MAILER_PATH', `/usr/bin/procmail')dnl<br>
define(`ALIAS_FILE', `/etc/aliases')dnl<br>
define(`STATUS_FILE', `/var/log/mail/statistics')dnl<br>
define(`UUCP_MAILER_MAX', `2000000')dnl<br>
define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl<br>
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl<br>
define(`confAUTH_OPTIONS', `A')dnl<br>
dnl #<br>
dnl # The following allows relaying if the user authenticates, and disallows<br>
dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links<br>
dnl #<br>
dnl define(`confAUTH_OPTIONS', `A p')dnl<br>
dnl #<br>
dnl # PLAIN is the preferred plaintext authentication method and used by<br>
dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do<br>
dnl # use LOGIN. Other mechanisms should be used if the connection is not<br>
dnl # guaranteed secure.<br>
dnl # Please remember that saslauthd needs to be running for AUTH.<br>
dnl #<br>
dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl<br>
dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl<br>
dnl #<br>
dnl # Rudimentary information on creating certificates for sendmail TLS:<br>
dnl # cd /usr/share/ssl/certs; make sendmail.pem<br>
dnl # Complete usage:<br>
dnl # make -C /usr/share/ssl/certs usage<br>
dnl #<br>
dnl define(`confCACERT_PATH', `/etc/pki/tls/certs')dnl<br>
dnl define(`confCACERT', `/etc/pki/tls/certs/ca-bundle.crt')dnl<br>
dnl define(`confSERVER_CERT', `/etc/pki/tls/certs/sendmail.pem')dnl<br>
dnl define(`confSERVER_KEY', `/etc/pki/tls/certs/sendmail.pem')dnl<br>
dnl #<br>
dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's<br>
dnl # slapd, which requires the file to be readble by group ldap<br>
dnl #<br>
dnl define(`confDONT_BLAME_SENDMAIL', `groupreadablekeyfile')dnl<br>
dnl #<br>
dnl define(`confTO_QUEUEWARN', `4h')dnl<br>
dnl define(`confTO_QUEUERETURN', `5d')dnl<br>
dnl define(`confQUEUE_LA', `12')dnl<br>
dnl define(`confREFUSE_LA', `18')dnl<br>
define(`confTO_IDENT', `0')dnl<br>
dnl FEATURE(delay_checks)dnl<br>
FEATURE(`no_default_msa', `dnl')dnl<br>
FEATURE(`smrsh', `/usr/sbin/smrsh')dnl<br>
FEATURE(`mailertable', `hash -o /etc/mail/mailertable.db')dnl<br>
FEATURE(`virtusertable', `hash -o /etc/mail/virtusertable.db')dnl<br>
FEATURE(redirect)dnl<br>
FEATURE(always_add_domain)dnl<br>
FEATURE(use_cw_file)dnl<br>
FEATURE(use_ct_file)dnl<br>
dnl #<br>
dnl # The following limits the number of processes sendmail can fork to accept<br>
dnl # incoming messages or process its message queues to 20.) sendmail refuses<br>
dnl # to accept connections once it has reached its quota of child processes.<br>
dnl #<br>
dnl define(`confMAX_DAEMON_CHILDREN', `20')dnl<br>
dnl #<br>
dnl # Limits the number of new connections per second. This caps the overhead<br>
dnl # incurred due to forking new sendmail processes. May be useful against<br>
dnl # DoS attacks or barrages of spam. (As mentioned below, a per-IP address<br>
dnl # limit would be useful but is not available as an option at this writing.)<br>
dnl #<br>
dnl define(`confCONNECTION_RATE_THROTTLE', `3')dnl<br>
dnl #<br>
dnl # The -t option will retry delivery if e.g. the user runs over his quota.<br>
dnl #<br>
FEATURE(local_procmail, `', `procmail -t -Y -a $h -d $u')dnl<br>
FEATURE(`access_db', `hash -T<TMPF> -o /etc/mail/access.db')dnl<br>
FEATURE(`blacklist_recipients')dnl<br>
EXPOSED_USER(`root')dnl<br>
dnl #<br>
dnl # For using Cyrus-IMAPd as POP3/IMAP server through LMTP delivery uncomment<br>
dnl # the following 2 definitions and activate below in the MAILER section the<br>
dnl # cyrusv2 mailer.<br>
dnl #<br>
dnl define(`confLOCAL_MAILER', `cyrusv2')dnl<br>
dnl define(`CYRUSV2_MAILER_ARGS', `FILE /var/lib/imap/socket/lmtp')dnl<br>
dnl #<br>
dnl # The following causes sendmail to only listen on the IPv4 loopback address<br>
dnl # <a href="http://127.0.0.1" target="_blank">127.0.0.1</a> and not on any other network devices. Remove the loopback<br>
dnl # address restriction to accept email from the internet or intranet.<br>
dnl DAEMON_OPTIONS(`Port=smtp,Addr=<a href="http://127.0.0.1" target="_blank">127.0.0.1</a>, Name=MTA')dnl<br>
dnl #<br>
dnl # The following causes sendmail to additionally listen to port 587 for<br>
dnl # mail from MUAs that authenticate. Roaming users who can't reach their<br>
dnl # preferred sendmail daemon due to port 25 being blocked or redirected find<br>
dnl # this useful.<br>
dnl #<br>
dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl<br>
dnl #<br>
dnl # The following causes sendmail to additionally listen to port 465, but<br>
dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed<br>
dnl # by STARTTLS is preferred, but roaming clients using Outlook Express can't<br>
dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS<br>
dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps<br>
dnl # when SSL is enabled-- STARTTLS support is available in version <a href="http://1.1.1." target="_blank">1.1.1.</a><br>
dnl #<br>
dnl # For this to work your OpenSSL certificates must be configured.<br>
dnl #<br>
dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl<br>
dnl #<br>
dnl # The following causes sendmail to additionally listen on the IPv6 loopback<br>
dnl # device. Remove the loopback address restriction listen to the network.<br>
dnl #<br>
dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl<br>
dnl #<br>
dnl # enable both ipv6 and ipv4 in sendmail:<br>
dnl #<br>
dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6')<br>
dnl #<br>
dnl # We strongly recommend not accepting unresolvable domains if you want to<br>
dnl # protect yourself from spam. However, the laptop and users on computers<br>
dnl # that do not have 24x7 DNS do need this.<br>
dnl #<br>
FEATURE(`accept_unresolvable_domains')dnl<br>
dnl #<br>
dnl FEATURE(`relay_based_on_MX')dnl<br>
dnl #<br>
dnl # Also accept email sent to "localhost.localdomain" as local email.<br>
dnl #<br>
LOCAL_DOMAIN(`localhost.localdomain')dnl<br>
dnl #<br>
dnl # The following example makes mail from this host and any additional<br>
dnl # specified domains appear to be sent from <a href="http://mydomain.com" target="_blank">mydomain.com</a><br>
dnl #<br>
dnl MASQUERADE_AS(`<a href="http://mydomain.com" target="_blank">mydomain.com</a>')dnl<br>
dnl #<br>
dnl # masquerade not just the headers, but the envelope as well<br>
dnl #<br>
dnl FEATURE(masquerade_envelope)dnl<br>
dnl #<br>
dnl # masquerade not just @<a href="http://mydomainalias.com" target="_blank">mydomainalias.com</a>, but @*.<a href="http://mydomainalias.com" target="_blank">mydomainalias.com</a> as well<br>
dnl #<br>
dnl FEATURE(masquerade_entire_domain)dnl<br>
dnl #<br>
dnl MASQUERADE_DOMAIN(localhost)dnl<br>
dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl<br>
dnl MASQUERADE_DOMAIN(<a href="http://mydomainalias.com" target="_blank">mydomainalias.com</a>)dnl<br>
dnl MASQUERADE_DOMAIN(mydomain.lan)dnl<br>
MAILER(smtp)dnl<br>
MAILER(procmail)dnl<br>
dnl MAILER(cyrusv2)dnl<br>
DAEMON_OPTIONS(`Name=smtp,Modifiers=b')<br>
<br>
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</blockquote></div><br>