sendmail

[smokey74]

can not connect to smtp server. It was working fine on 9-5-08. It just stoped working. I can send and receive form the server but not the clients. I can receive email sent by the server cmd line to a client but that is it.

 

[elgrandeperro]

Try and "telnet servername 25" from a relaying client to see if it brings up a prompt.

If it does, you can spoof up a mail letter and see if it accepts it.

 

[smokey74]

no i can not telnet server 25. unable to connect.

 

[elgrandeperro]

Then either the process has died, or you are blocking it either with a firewall or software firewall.

Does the sendmail process appear? Remember, a client on that machine does not need to talk to the daemon process, they invoke mailing by themselves.

Try:

netstat -an | grep 25 | grep -i list

Is anything listening on port 25?

 

[smokey74]

netstat -an | grep 25 | grep -i list
tcp 0 0 127.0.0.1:25 0.0.0.0:* Listen
4469 root 09:46 sendmail: accepting connections
4478 smmsp 09:46 sendmail: Queue runner@01:00:00 for /var/spool/clientmqueue

 

[elgrandeperro]

You are only listening to localhost, so something has changed on what ip address you are binding on.

 

[smokey74]

I am not sure i am a newbie and was stuck with this problem

 

[smokey74]

My network interface in 10.0.0.3

 

[normntwrk]

Not sure what distribution you have but look at your sendmail.mc file

If it looks like this it will only listen on the loacl loopback
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
---------------------------------

You want it to look like this
dnl #
DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
dnl #

Norm

 

[smokey74]

divert(-1)dnl
Other dnl #
Other dnl # This is the sendmail macro config file for m4. If you make changes to
Other dnl # /etc/mail/sendmail.mc, you will need to regenerate the
Other dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf package is
Other dnl # installed and then performing a
Other dnl #
Other dnl # make -C /etc/mail
Other dnl #
Other include(`/usr/share/sendmail-cf/m4/cf.m4')dnl
Other VERSIONID(`setup for Red Hat Linux')dnl
OS Type OSTYPE(`linux')dnl
Other dnl #
Other dnl # default logging level is 9, you might want to set it higher to
Other dnl # debug the configuration
Other dnl #
Other dnl define(`confLOG_LEVEL', `9')dnl
Other dnl #
Other dnl # Uncomment and edit the following line if your outgoing mail needs to
Other dnl # be sent out through an external mail server:
Other dnl #
Other dnl define(`SMART_HOST',`smtp.your.provider')
Other dnl #
Define define(`confDEF_USER_ID',``8:12'')dnl
Other dnl define(`confAUTO_REBUILD')dnl
Define define(`confTO_CONNECT', `1m')dnl
Define define(`confTRY_NULL_MX_LIST',true)dnl
Define define(`confDONT_PROBE_INTERFACES',true)dnl
Define define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl
Define define(`ALIAS_FILE', `/etc/aliases')dnl
Define define(`STATUS_FILE', `/var/log/mail/statistics')dnl
Define define(`UUCP_MAILER_MAX', `2000000')dnl
Define define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
Define define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
Define define(`confAUTH_OPTIONS', `A')dnl
Other dnl #
Other dnl # The following allows relaying if the user authenticates, and disallows
Other dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links
Other dnl #
Other dnl define(`confAUTH_OPTIONS', `A p')dnl
Other dnl #
Other dnl # PLAIN is the preferred plaintext authentication method and used by
Other dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do
Other dnl # use LOGIN. Other mechanisms should be used if the connection is not
Other dnl # guaranteed secure.
Other dnl #
Other dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
Other dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
Other dnl #
Other dnl # Rudimentary information on creating certificates for sendmail TLS:
Other dnl # make -C /usr/share/ssl/certs usage
Other dnl # or use the included makecert.sh script
Other dnl #
Other dnl define(`confCACERT_PATH',`/usr/share/ssl/certs')
Other dnl define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt')
Other dnl define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem')
Other dnl define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem')
Other dnl #
Other dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's
Other dnl # slapd, which requires the file to be readble by group ldap
Other dnl #
Other dnl define(`confDONT_BLAME_SENDMAIL',`groupreadablekeyfile')dnl
Other dnl #
Other dnl define(`confTO_QUEUEWARN', `4h')dnl
Other dnl define(`confTO_QUEUERETURN', `5d')dnl
Other dnl define(`confQUEUE_LA', `12')dnl
Other dnl define(`confREFUSE_LA', `18')dnl
Define define(`confTO_IDENT', `0')dnl
Other dnl FEATURE(delay_checks)dnl
Feature FEATURE(`no_default_msa',`dnl')dnl
Feature FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
Feature FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl
Feature FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl
Feature FEATURE(redirect)dnl
Feature FEATURE(always_add_domain)dnl
Feature FEATURE(use_cw_file)dnl
Feature FEATURE(use_ct_file)dnl
Other dnl #
Other dnl # The -t option will retry delivery if e.g. the user runs over his quota.
Other dnl #
Feature FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
Feature FEATURE(`access_db',`hash -T<TMPF> -o /etc/mail/access.db')dnl
Feature FEATURE(`blacklist_recipients')dnl
Other EXPOSED_USER(`root')dnl
Other dnl #
Other dnl # The following causes sendmail to only listen on the IPv4 loopback address
Other dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
Other dnl # address restriction to accept email from the internet or intranet.
Other dnl #
Other DAEMON_OPTIONS(`Port=smtp, Name=MTA')dnl
Other dnl #
Other dnl # The following causes sendmail to additionally listen to port 587 for
Other dnl # mail from MUAs that authenticate. Roaming users who can't reach their
Other dnl # preferred sendmail daemon due to port 25 being blocked or redirected find
Other dnl # this useful.
Other dnl #
Other dnl DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
Other dnl #
Other dnl # The following causes sendmail to additionally listen to port 465, but
Other dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed
Other dnl # by STARTTLS is preferred, but roaming clients using Outlook Express can't
Other dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS
Other dnl # and doesn't support the deprecated smtps; Evolution <1.1.1 uses smtps
Other dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1.
Other dnl #
Other dnl # For this to work your OpenSSL certificates must be configured.
Other dnl #
Other dnl DAEMON_OPTIONS(`Port=smtps, Name=TLSMTA, M=s')dnl
Other dnl #
Other dnl # The following causes sendmail to additionally listen on the IPv6 loopback
Other dnl # device. Remove the loopback address restriction listen to the network.
Other dnl #
Other dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')dnl
Other dnl #
Other dnl # enable both ipv6 and ipv4 in sendmail:
Other dnl #
Other dnl DAEMON_OPTIONS(`Name=MTA-v4, Family=inet, Name=MTA-v6, Family=inet6')
Other dnl #
Other dnl # We strongly recommend not accepting unresolvable domains if you want to
Other dnl # protect yourself from spam. However, the laptop and users on computers
Other dnl # that do not have 24x7 DNS do need this.
Other dnl #
Feature FEATURE(`accept_unresolvable_domains')dnl
Other dnl #
Other dnl FEATURE(`relay_based_on_MX')dnl
Other dnl #
Other dnl # Also accept email sent to "localhost.localdomain" as local email.
Other dnl #
Other LOCAL_DOMAIN(`localhost.localdomain')dnl
Other dnl #
Other dnl # The following example makes mail from this host and any additional
Other dnl # specified domains appear to be sent from mydomain.com
Other dnl #
Other dnl MASQUERADE_AS(`mydomain.com')dnl
Other dnl #
Other dnl # masquerade not just the headers, but the envelope as well
Other dnl #
Other dnl FEATURE(masquerade_envelope)dnl
Other dnl #
Other dnl # masquerade not just @mydomainalias.com, but @*.mydomainalias.com as well
Other dnl #
Other dnl FEATURE(masquerade_entire_domain)dnl
Other dnl #
Other dnl MASQUERADE_DOMAIN(localhost)dnl
Other dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
Other dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
Other dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
Mailer MAILER(smtp)dnl
Other
Mailer MAILER(procmail)dnl

 

[RhythmAce]

elgrandeperro is right. Your server seems to be listening on the loopback device. However your .mc file seems to be ok. My guess is that sendmail has be restarted with a funky sendmail.cf. To check this create a new sendmail.cf from this sendmail.mc file. Here is the command to do that:

m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

Then restart sendmail:

service sendmail restart

Then run netstat -an|grep 25 againd and see what it says.