how to configure sendmail server in linux

7/25/2019 How to Configure Sendmail Server in Linux

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How to confgure sendmail server in Linux

In a company environment, email is an essential component to the work day. Email is used to

communicate with both internal employees and external customers. In exam you will be tested to

configure the send mail serverfor you local LAN.

y default sendmail server allows to connect to local host only. !o we should edit

the/etc/mail/sendmail.mcfile to allow connect to other hosts.

"he sendmaildaemon is configured from a directory of files in #etc#mail and a directory of

configuration files in/usr/share/sendmail-cf. "here are two basic configuration files$

sendmail.cf"he main sendmail configuration file.

sendmail.mcA macro that%s easier to edit, which can be used to generate a

new sendmail.cffile.

&or this example we are using two systems one linux server one linux clients. "hese are the pre 'uest

for a sendmail server

A linux server with ip address ()*.(+.-.*/ and hostname !erver

A linux client with ip address ()*.(+.-.( and hostname 0lient(

A 0onfigured 1N! server on Linux server

2pdated #etc#hosts file on both linux system

3unning portmap and xinetd services

&irewall should be off on server

4e suggest you to review that article and configure 1N! server before start configuration

of sendmail server.5nce you have completed the necessary steps follow this guide.

0onfigure sendmail server

sendmailand m4 rpm are re'uired to configure sendmail server check them for install if not found

install them.

6ail server program reads the/etc/mail/sendmail.cf. "o change the configuration on mail server, we

should edit the/etc/mail/sendmail.mcfile. 4hen !endmail is started or restarted with the service

sendmail restartcommand a newsendmail.cffile is automatically generated if sendmail.mchas

been modified. In exam you should generate it with m4command.

open/etc/mail/sendmail.mcfor editing

show hidden line with : set nu option on vi command modey default, the following line limits sendmail access to connect local host only [line no 116]

7ou can allow other computers to use your sendmail serverby commenting out this line.

In the sendmail.mcfile , lines that begin with dnl, which stands for delete to new line, are considered

comments. !ome lines end with dnl, but lines ending in dnl are not comments
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comment this line with dnlkeyword followed by # sign

save this file with :wqand exit.

Now generate new sendmail.cffile by using m4command as shown here

Now restart sendmail serviceand also set it on with chkconfig

if sendmail servicerestart without any error means you have configured sendmailsuccessfully.

0onfigure sendmail client side

4e are using another linux system to test sendmail server. All configuration are same as you have

done on server system.

0heck sendmailand m4rpm for install. 5pen/etc/mail/sendmail.mcfile and locate line no 116and

put a dnlwith # sing and save file. All step are same which you have done on server.

Now generate new sendmail.cffile by using m4command as shown here

Now restart sendmail serviceand also set it on with chkconfig

"esting of sendmail server

4e will test sendmail serverby sending and receiving mail in lab environment. for this we use two

user one on each system.

Now create one user on each system vinitaon server


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and nikita on client sstem

Now send mail from user vinita to nikita and from nikita to user vinita and also check each others mail

by mail command

2se full user name to send mail. &or example to send mail to nikita use nikita!client1


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how to configure sendmail server in linux

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