How to Configure SendMail / Mail via Command Line On Linux 4.x to 7.x

You should whitelist this server IP for email, after then you will follow the document.

login as: root

root@192.168.1.10's password:

Last login: Wed Sep 26 17:11:15 2018

[root@abc ~] # mail

No mail for root

 [root@abc ~] #

[root@abc ~] # su - oracle

Last login: Sat Sep 29 19:26:55 PKT 2018 from 140.1.25.65 on pts/3

[oracle@abc ~]$ mail

No mail for oracle

[oracle@abc ~] $ exit

logout

 [root@abc ~] # ls

anaconda-ks.cfg  Downloads openscap_data  Templates

Desktop          initial-setup-ks.cfg  Pictures       Videos

Documents        Music                 Public

[root@abc ~]# df -h

Filesystem      Size  Used Avail Use% Mounted on

devtmpfs        3.9G     0 3.9G   0% /dev

tmpfs           3.9G   24K 3.9G   1% /dev/shm

tmpfs           3.9G  9.1M  3.9G   1% /run

tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup

/dev/sda2        50G  4.6G   43G  10% /

/dev/sda1       488M  164M  289M  37% /boot

/dev/sdb1       220G   34G  176G  17% /u01

tmpfs           787M   72K  787M   1% /run/user/0

/dev/sr0        4.6G  4.6G     0 100% /media/cdrom

tmpfs           787M     0  787M   0% /run/user/1000

[root@abc ~]# cd /media/cdrom/

[root@abc cdrom]# cd Packages/

 [root@abc Packages]# ls *mail*

fetchmail-6.3.24-7.el7.x86_64.rpm

javamail-1.4.6-8.el7.noarch.rpm

libreport-plugin-mailx-2.1.11-38.0.1.el7.x86_64.rpm

mailcap-2.1.41-2.el7.noarch.rpm

mailman-2.1.15-24.el7.x86_64.rpm

mailx-12.5-16.el7.x86_64.rpm

pcp-pmda-mailq-3.11.8-7.el7.x86_64.rpm

pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm

procmail-3.22-36.el7.x86_64.rpm

sendmail-8.14.7-5.el7.x86_64.rpm

sendmail-cf-8.14.7-5.el7.noarch.rpm

 [root@abc Packages] # mail

No mail for root

[root@abc Packages] # mail -s

mail: option requires an argument -- s

Usage: mail -eiIUdEFntBDNHRVv~ -T FILE -u USER -h hops -r address -s SUBJECT -a FILE -q FILE -f FILE -A ACCOUNT -b USERS -c USERS -S OPTION users

[root@abc Packages] # yum --disablerepo=\* --enablerepo=media install *sendmail*

Loaded plugins: langpacks, ulninfo

Examining pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

Marking pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm to be installed

Examining sendmail-8.14.7-5.el7.x86_64.rpm: sendmail-8.14.7-5.el7.x86_64

Marking sendmail-8.14.7-5.el7.x86_64.rpm to be installed

Examining sendmail-cf-8.14.7-5.el7.noarch.rpm: sendmail-cf-8.14.7-5.el7.noarch

Marking sendmail-cf-8.14.7-5.el7.noarch.rpm to be installed

Resolving Dependencies

--> Running transaction check

---> Package pcp-pmda-sendmail.x86_64 0:3.11.8-7.el7 will be installed

--> Processing Dependency: pcp = 3.11.8-7.el7 for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

media                                                    | 3.6 kB     00:00

--> Processing Dependency: pcp-libs = 3.11.8-7.el7 for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

--> Processing Dependency: libpcp.so.3(PCP_3.0)(64bit) for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

--> Processing Dependency: libpcp_pmda.so.3(PCP_PMDA_3.0)(64bit) for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

--> Processing Dependency: libpcp_pmda.so.3(PCP_PMDA_3.1)(64bit) for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

--> Processing Dependency: libpcp.so.3()(64bit) for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

--> Processing Dependency: libpcp_pmda.so.3()(64bit) for package: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

---> Package sendmail.x86_64 0:8.14.7-5.el7 will be installed

--> Processing Dependency: procmail for package: sendmail-8.14.7-5.el7.x86_64

--> Processing Dependency: libhesiod.so.0()(64bit) for package: sendmail-8.14.7-5.el7.x86_64

---> Package sendmail-cf.noarch 0:8.14.7-5.el7 will be installed

--> Running transaction check

---> Package hesiod.x86_64 0:3.2.1-3.el7 will be installed

---> Package pcp.x86_64 0:3.11.8-7.el7 will be installed

--> Processing Dependency: pcp-selinux = 3.11.8-7.el7 for package: pcp-3.11.8-7.el7.x86_64

---> Package pcp-libs.x86_64 0:3.11.8-7.el7 will be installed

--> Processing Dependency: pcp-conf = 3.11.8-7.el7 for package: pcp-libs-3.11.8-7.el7.x86_64

---> Package procmail.x86_64 0:3.22-36.el7 will be installed

--> Running transaction check

---> Package pcp-conf.x86_64 0:3.11.8-7.el7 will be installed

---> Package pcp-selinux.x86_64 0:3.11.8-7.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

================================================================================

 Package       Arch   Version      Repository                              Size

================================================================================

Installing:

 pcp-pmda-sendmail

               x86_64 3.11.8-7.el7 /pcp-pmda-sendmail-3.11.8-7.el7.x86_64  39 k

 sendmail      x86_64 8.14.7-5.el7 /sendmail-8.14.7-5.el7.x86_64          1.7 M

 sendmail-cf   noarch 8.14.7-5.el7 /sendmail-cf-8.14.7-5.el7.noarch       938 k

Installing for dependencies:

 hesiod        x86_64 3.2.1-3.el7 media                                   29 k

 pcp           x86_64 3.11.8-7.el7 media                                  917 k

 pcp-conf      x86_64 3.11.8-7.el7 media                                   28 k

 pcp-libs      x86_64 3.11.8-7.el7 media                                  325 k

 pcp-selinux   x86_64 3.11.8-7.el7 media                                   23 k

 procmail      x86_64 3.22-36.el7  media                                  171 k

Transaction Summary

================================================================================

Install  3 Packages (+6 Dependent packages)

Total size: 4.1 M

Total download size: 1.5 M

Installed size: 7.0 M

Is this ok [y/d/N]: y

Downloading packages:

--------------------------------------------------------------------------------

Total                                              921 kB/s | 1.5 MB  00:01

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

Warning: RPMDB altered outside of yum.

  Installing : hesiod-3.2.1-3.el7.x86_64                                        1/9

  Installing : pcp-conf-3.11.8-7.el7.x86_64                                 2/9

  Installing : pcp-libs-3.11.8-7.el7.x86_64                                 3/9

  Installing : pcp-selinux-3.11.8-7.el7.x86_64                              4/9

  Installing : pcp-3.11.8-7.el7.x86_64                                      5/9

  Installing : procmail-3.22-36.el7.x86_64                                  6/9

  Installing: sendmail-8.14.7-5.el7.x86_64                                 7/9

  Installing : sendmail-cf-8.14.7-5.el7.noarch                              8/9

  Installing : pcp-pmda-sendmail-3.11.8-7.el7.x86_64                        9/9

  Verifying  : sendmail-cf-8.14.7-5.el7.noarch                              1/9

  Verifying  : procmail-3.22-36.el7.x86_64                                  2/9

  Verifying  : pcp-pmda-sendmail-3.11.8-7.el7.x86_64                        3/9

  Verifying  : pcp-3.11.8-7.el7.x86_64                                      4/9

  Verifying  : sendmail-8.14.7-5.el7.x86_64                                 5/9

  Verifying  : pcp-conf-3.11.8-7.el7.x86_64                                 6/9

  Verifying  : hesiod-3.2.1-3.el7.x86_64                                    7/9

  Verifying  : pcp-libs-3.11.8-7.el7.x86_64                                 8/9

  Verifying  : pcp-selinux-3.11.8-7.el7.x86_64                              9/9

Installed:

  pcp-pmda-sendmail.x86_64 0:3.11.8-7.el7     sendmail.x86_64 0:8.14.7-5.el7

  sendmail-cf.noarch 0:8.14.7-5.el7

Dependency Installed:

  hesiod.x86_64 0:3.2.1-3.el7              pcp.x86_64 0:3.11.8-7.el7

  pcp-conf.x86_64 0:3.11.8-7.el7           pcp-libs.x86_64 0:3.11.8-7.el7

  pcp-selinux.x86_64 0:3.11.8-7.el7        procmail.x86_64 0:3.22-36.el7

Complete!

[root@abc Packages] # mail

No mail for root

[root@abc Packages] # echo 'this is message body'

this is message body

[root@abc Packages] # ls *mail*

fetchmail-6.3.24-7.el7.x86_64.rpm                    pcp-pmda-mailq-3.11.8-7.el7.x86_64.rpm

javamail-1.4.6-8.el7.noarch.rpm                      pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm

libreport-plugin-mailx-2.1.11-38.0.1.el7.x86_64.rpm  procmail-3.22-36.el7.x86_64.rpm

mailcap-2.1.41-2.el7.noarch.rpm                      sendmail-8.14.7-5.el7.x86_64.rpm

mailman-2.1.15-24.el7.x86_64.rpm                     sendmail-cf-8.14.7-5.el7.noarch.rpm

mailx-12.5-16.el7.x86_64.rpm

[root@abc Packages] # yum --disablerepo=\* --enablerepo=media install *mail*

Loaded plugins: langpacks, ulninfo

Examining fetchmail-6.3.24-7.el7.x86_64.rpm: fetchmail-6.3.24-7.el7.x86_64

Marking fetchmail-6.3.24-7.el7.x86_64.rpm to be installed

Examining javamail-1.4.6-8.el7.noarch.rpm: javamail-1.4.6-8.el7.noarch

Marking javamail-1.4.6-8.el7.noarch.rpm to be installed

Examining libreport-plugin-mailx-2.1.11-38.0.1.el7.x86_64.rpm: libreport-plugin-mailx-2.1.11-38.0.1.el7.x86_64

libreport-plugin-mailx-2.1.11-38.0.1.el7.x86_64.rpm: does not update installed package.

Examining mailcap-2.1.41-2.el7.noarch.rpm: mailcap-2.1.41-2.el7.noarch

mailcap-2.1.41-2.el7.noarch.rpm: does not update installed package.

Examining mailman-2.1.15-24.el7.x86_64.rpm: 3:mailman-2.1.15-24.el7.x86_64

Marking mailman-2.1.15-24.el7.x86_64.rpm to be installed

Examining mailx-12.5-16.el7.x86_64.rpm: mailx-12.5-16.el7.x86_64

mailx-12.5-16.el7.x86_64.rpm: does not update installed package.

Examining pcp-pmda-mailq-3.11.8-7.el7.x86_64.rpm: pcp-pmda-mailq-3.11.8-7.el7.x86_64

Marking pcp-pmda-mailq-3.11.8-7.el7.x86_64.rpm to be installed

Examining pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm: pcp-pmda-sendmail-3.11.8-7.el7.x86_64

pcp-pmda-sendmail-3.11.8-7.el7.x86_64.rpm: does not update installed package.

Examining procmail-3.22-36.el7.x86_64.rpm: procmail-3.22-36.el7.x86_64

procmail-3.22-36.el7.x86_64.rpm: does not update installed package.

Examining sendmail-8.14.7-5.el7.x86_64.rpm: sendmail-8.14.7-5.el7.x86_64

sendmail-8.14.7-5.el7.x86_64.rpm: does not update installed package.

Examining sendmail-cf-8.14.7-5.el7.noarch.rpm: sendmail-cf-8.14.7-5.el7.noarch

sendmail-cf-8.14.7-5.el7.noarch.rpm: does not update installed package.

Resolving Dependencies

--> Running transaction check

---> Package fetchmail.x86_64 0:6.3.24-7.el7 will be installed

---> Package javamail.noarch 0:1.4.6-8.el7 will be installed

---> Package mailman.x86_64 3:2.1.15-24.el7 will be installed

--> Processing Dependency: httpd for package: 3:mailman-2.1.15-24.el7.x86_64

media                                                                                        | 3.6 kB  00:00:00

--> Processing Dependency: python-dns for package: 3:mailman-2.1.15-24.el7.x86_64

---> Package pcp-pmda-mailq.x86_64 0:3.11.8-7.el7 will be installed

--> Running transaction check

---> Package httpd.x86_64 0:2.4.6-67.0.1.el7 will be installed

--> Processing Dependency: httpd-tools = 2.4.6-67.0.1.el7 for package: httpd-2.4.6-67.0.1.el7.x86_64

---> Package python-dns.noarch 0:1.12.0-4.20150617git465785f.el7 will be installed

--> Running transaction check

---> Package httpd-tools.x86_64 0:2.4.6-67.0.1.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================

 Package            Arch       Version                                Repository                               Size

=====================================================================================

Installing:

 fetchmail          x86_64     6.3.24-7.el7                           /fetchmail-6.3.24-7.el7.x86_64          2.1 M

 javamail           noarch     1.4.6-8.el7                            /javamail-1.4.6-8.el7.noarch            1.8 M

 mailman            x86_64     3:2.1.15-24.el7                        /mailman-2.1.15-24.el7.x86_64            34 M

 pcp-pmda-mailq     x86_64     3.11.8-7.el7                           /pcp-pmda-mailq-3.11.8-7.el7.x86_64      23 k

Installing for dependencies:

 httpd              x86_64     2.4.6-67.0.1.el7                       media                                   1.2 M

 httpd-tools        x86_64     2.4.6-67.0.1.el7                       media                                    87 k

 python-dns         noarch     1.12.0-4.20150617git465785f.el7        media                                   233 k

Transaction Summary

=====================================================================================

Install  4 Packages (+3 Dependent packages)

Total size: 39 M

Total download size: 1.5 M

Installed size: 42 M

Is this ok [y/d/N]: y

Downloading packages:

--------------------------------------------------------------------------------------------------------------------

Total                                                                               3.4 MB/s | 1.5 MB  00:00:00

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  Installing : httpd-tools-2.4.6-67.0.1.el7.x86_64                                                              1/7

  Installing : httpd-2.4.6-67.0.1.el7.x86_64                                                                    2/7

  Installing : python-dns-1.12.0-4.20150617git465785f.el7.noarch                                                3/7

  Installing : 3:mailman-2.1.15-24.el7.x86_64                                                                   4/7

  Installing : fetchmail-6.3.24-7.el7.x86_64                                                                    5/7

  Installing : javamail-1.4.6-8.el7.noarch                                                                      6/7

  Installing : pcp-pmda-mailq-3.11.8-7.el7.x86_64                                                               7/7

  Verifying  : httpd-2.4.6-67.0.1.el7.x86_64                                                                    1/7

  Verifying  : 3:mailman-2.1.15-24.el7.x86_64                                                                   2/7

  Verifying  : pcp-pmda-mailq-3.11.8-7.el7.x86_64                                                               3/7

  Verifying  : python-dns-1.12.0-4.20150617git465785f.el7.noarch                                                4/7

  Verifying  : javamail-1.4.6-8.el7.noarch                                                                      5/7

  Verifying  : httpd-tools-2.4.6-67.0.1.el7.x86_64                                                              6/7

  Verifying  : fetchmail-6.3.24-7.el7.x86_64                                                                    7/7

Installed:

  fetchmail.x86_64 0:6.3.24-7.el7   javamail.noarch 0:1.4.6-8.el7      mailman.x86_64 3:2.1.15-24.el7

  pcp-pmda-mailq.x86_64 0:3.11.8-7.el7

Dependency Installed:

  httpd.x86_64 0:2.4.6-67.0.1.el7   httpd-tools.x86_64 0:2.4.6-67.0.1.el7

  python-dns.noarch 0:1.12.0-4.20150617git465785f.el7

Complete!

 [root@abc Packages]# sendmail

Recipient names must be specified

 [root@abc Packages]# echo "furqan"

furqan

[root@abc Packages]# echo "furqan" | sendmail furqan-hafeez@abc.com

You have mail in /var/spool/mail/root

[root@abc Packages]# cd

[root@abc ~]# cd /etc/sysconfig/

[root@abc sysconfig]# vi sendmail

[root@abc sysconfig]# ls *mail*

sendmail

[root@abc sysconfig]# telnet

bash: telnet: command not found...

[root@abc sysconfig]# cd /media/cdrom/

 [root@abc cdrom]# cd Packages/

[root@abc Packages]# ls telnet*

telnet-0.17-64.el7.x86_64.rpm  telnet-server-0.17-64.el7.x86_64.rpm

[root@abc Packages] # yum --disablerepo=\* --enablerepo=media install *telnet*

Loaded plugins: langpacks, ulninfo

Examining telnet-0.17-64.el7.x86_64.rpm: 1:telnet-0.17-64.el7.x86_64

Marking telnet-0.17-64.el7.x86_64.rpm to be installed

Examining telnet-server-0.17-64.el7.x86_64.rpm: 1:telnet-server-0.17-64.el7.x86_64

Marking telnet-server-0.17-64.el7.x86_64.rpm to be installed

Resolving Dependencies

--> Running transaction check

---> Package telnet.x86_64 1:0.17-64.el7 will be installed

---> Package telnet-server.x86_64 1:0.17-64.el7 will be installed

--> Finished Dependency Resolution

Dependencies Resolved

=====================================================================================

 Package                 Arch             Version                 Repository                                   Size

=====================================================================================

Installing:

 telnet                  x86_64           1:0.17-64.el7           /telnet-0.17-64.el7.x86_64                  113 k

 telnet-server           x86_64           1:0.17-64.el7           /telnet-server-0.17-64.el7.x86_64            55 k

Transaction Summary

=====================================================================================

Install  2 Packages

Total size: 168 k

Installed size: 168 k

Is this ok [y/d/N]: y

Downloading packages:

Running transaction check

Running transaction test

Transaction test succeeded

Running transaction

  Installing : 1:telnet-server-0.17-64.el7.x86_64                                                               1/2

  Installing : 1:telnet-0.17-64.el7.x86_64                                                                      2/2

  Verifying  : 1:telnet-0.17-64.el7.x86_64                                                                      1/2

  Verifying  : 1:telnet-server-0.17-64.el7.x86_64                                                               2/2

Installed:

  telnet.x86_64 1:0.17-64.el7telnet-server.x86_64 1:0.17-64.el7

Complete!

[root@abc Packages]# telnet

telnet>

telnet> quit

[root@abc Packages]# echo "furqan" | sendmail furqan-hafeez@abc.com

[root@abc Packages]# echo "furqan" | sendmail furqan-hafeez@abc.com

[root@abc Packages]#

[root@abc Packages]# echo "furqan" | mail -s"Database Server - Summary of last day" backupadmin@abc.com

[root@abc Packages] #

[root@abc Packages] # systemctl list-units --type=service | grep running

  abrt-oops.service                                                                         loaded active running AB

  abrtd.service                                                                             loaded active running AB

  accounts-daemon.service                                                                   loaded active running Ac

  alsa-state.service                                                                        loaded active running Ma

  atd.service                                                                               loaded active running Jo

  auditd.service                                                                            loaded active running Se

  avahi-daemon.service                                                                      loaded active running Av

  colord.service                                                                            loaded active running Ma

  crond.service                                                                             loaded active running Co

  cups.service                                                                              loaded active running CU

  dbus.service                                                                              loaded active running D-

  gdm.service                                                                               loaded active running GN

  gssproxy.service                                                                          loaded active running GS

  irqbalance.service                                                                        loaded active running ir

  ksmtuned.service                                                                          loaded active running Ke

  libstoragemgmt.service                                                                    loaded active running li

  libvirtd.service                                                                          loaded active running Vi

  lvm2-lvmetad.service                                                                      loaded active running LV

  mcelog.service                                                                            loaded active running Ma

  ModemManager.service                                                                      loaded active running Mo

  NetworkManager.service                                                                    loaded active running Ne

  packagekit.service                                                                        loaded active running Pa

  polkit.service                                                                            loaded active running Au

  postfix.service                                                                           loaded active running Po

  rhnsd.service                                                                             loaded active running LS

  rsyslog.service                                                                           loaded active running Sy

  rtkit-daemon.service                                                                      loaded active running Re

  smartd.service                                                                            loaded active running Se

  sshd.service                                                                              loaded active running Op

  systemd-journald.service                                                                  loaded active running Jo

  systemd-logind.service                                                                    loaded active running Lo

  systemd-udevd.service                                                                     loaded active running ud

  tuned.service                                                                             loaded active running Dy

  udisks2.service                                                                           loaded active running Di

  upower.service                                                                            loaded active running Da

  wpa_supplicant.service                                                                    loaded active running WP

[root@abc Packages] # postfix start

postfix/postfix-script: fatal: the Postfix mail system is already running

[root@abc Packages] # postfix reload

postfix/postfix-script: refreshing the Postfix mail system

[root@abc Packages] # vi /etc/postfix/

access         generic        main.cf        relocated      virtual

canonical      header_checks  master.cf      transport

[root@abc Packages] # vi /etc/postfix/access

[root@abc Packages] # cd /etc/postfix/

[root@abc postfix] # ls

access canonical generic header_checks main.cf master.cf relocated transport virtual

[root@abc postfix] # postfix start

postfix/postfix-script: fatal: the Postfix mail system is already running

 [root@abc postfix] #

[root@abc postfix] # echo "furqan"

furqan

[root@abc postfix] # echo "furqan" |mail -s"DR Database Configuration Status" backupadmin@abc.com

[root@abc postfix] # echo "furqan" |mail -s"DR Database Configuration Status" backupadmin@abc.com

[root@abc postfix] # service sendmail restart

Redirecting to /bin/systemctl restart sendmail.service

[root@abc postfix] # systemctl restart sendmail.service

[root@abc postfix] # systemctl stop sendmail.service

[root@abc postfix] # systemctl start sendmail.service

[root@abc postfix] # echo "furqan" |mail -s"DR Database Configuration Status" backdm@abc.com

[root@abc postfix] # echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[root@abc postfix] #

[root@abc postfix] #

[root@abc postfix] # su - oracle

Last login: Sun Sep 30 17:54:10 PKT 2018 on pts/0

[oracle@abc ~] $ echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[oracle@abc ~] $ echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[oracle@abc ~] $ echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[oracle@abc ~] $ echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[oracle@abc ~] $ echo "furqan hafeez" |mail -s"DR Database Configuration Status" furqan-hafeez@abc.com

[oracle@abc ~] $