How to install Mail Server (MTA)?

Mail Transfer Agent:

A mail server (also known as a mail transfer agent or MTA, a mail transport agent, a mail router or an Internet mailer) is an application that receives incoming e-mail from local users (people within the same domain) and remote senders and forwards outgoing e-mail for delivery. A computer dedicated to running such applications is also called a mail server. The default MTA in Ubuntu is Postfix, but exim4 is also fully supported and in the main repository.

Exim Transfer Agent:

Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more general. There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail. Exim can be installed in place of Sendmail, although the configuration of Exim is quite different.

Step 1. First install the Postfix package-exim4  from the Main repository as :

apt-get install exim4  exim4-config

Step 2. Configuration: From terminal prompt ,run following command:

 dpkg-reconfigure exim4-config

You will see the ‘Package Configuration’ interface. Here, select the options as mentioned in the following:

  • Choose  : mail sent by smarthost; received via SMTP or fetchmail
  • Type System Mail Name: e.g.
  • Type IP Adresses to listen on for incoming SMTP connections:
  • Leave Other destinations for which mail is accepted blank
  • Leave Machines to relay mail for: blank
  • Type Machine handling outgoing mail for this host (smarthost):
  • Choose NO, don’t hide local mail name in outgoing mail.
  • Chose NO, don’t keep number of DNS-queries minimal (Dial-on-Demand).
  • Choose mbox
  • Choose NO, split configuration into small files
  • Mail for postmaster. Leaving blank will not cause any problems though it is not recommended

Step 3: Open the file /etc/exim4/exim4.conf.template by

sudo gedit /etc/exim4/exim4.conf.template

Find the line .ifdef DCconfig_smarthost DCconfig_satelliteand add the following in that section

       driver = manualroute
       domains = ! +local_domains
       transport = gmail_smtp
       route_list = *

If you have any other smarthost defined with “domains = ! +local_domains” remove that smarthost.

  • Find the “begin authenticators”. In that section add the following
           driver = plaintext
           public_name = LOGIN
           client_send = : : YourGmailPassword

    Make sure you have no other authenticators with the same public_name (LOGIN).

  • Comment out the whole sectionin the bottom starting with:login:
    driver = plaintext
    public_name = LOGIN

    Starting fro login upto end, comment the whole file.

  • Find the comment  “transport/30_exim4-config_remote_smtp_smarthost”. In that section add
           driver = smtp
           port = 587
           hosts_require_auth = $host_address
           hosts_require_tls = $host_address
  • Step 4:
  • Run update-exim4.conf
  • Do /etc/init.d/exim4 restart

That should be it. You can test by using the command line mail client.

  • Run mail
  • Give a subject and press enter
  • Type something and press enter
  • Type a single . (dot) and press enter
  • Press enter for a blank CC:

This was on an Ubuntu server. And all is done !

About Priyanka Kapoor

Simple, Hardworking & friendly.....
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