# Linux Configure Sendmail as SMTP Mail Client ( submission MTA )

**URL:** <https://forums.thehomestack.io/t/linux-configure-sendmail-as-smtp-mail-client-submission-mta/4240>\
**Category:** Linux - General\
**Created:** [February 10, 2013, 1:48pm UTC](https://forums.thehomestack.io/t/linux-configure-sendmail-as-smtp-mail-client-submission-mta/4240 "2013-02-10T13:48:43Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![steve.ling](https://forums.thehomestack.io/letter_avatar_proxy/v4/letter/s/d6d6ee/32.png) [@steve.ling](https://forums.thehomestack.io/u/steve.ling)\
**Post date:** [February 10, 2013, 1:48pm UTC](https://forums.thehomestack.io/t/linux-configure-sendmail-as-smtp-mail-client-submission-mta/4240/1 "2013-02-10T13:48:43Z")

</div>

If you have a central e-mail server. Other servers does not need to operate as a mail server. How do I configure Sendmail as submission-only e-mail server (mail client) under CentOS / Fedora / RHEL / Debian Linux / UNIX like operating systems?

Sendmail or any MTA can work in two different modes. It can accept incoming SMTP e-mail requests and send mail from the local machine / workstation or server (cluster node). This is called outbound MTA and it always runes in a queue-only mode.

Step # 1: Disable Sendmail Daemon In a Listing Mode

Edit the file /etc/sysconfig/sendmail using the text editor such as vi, enter:

```auto
# vi /etc/sysconfig/sendmail

```

Modify the line:

```auto
DAEMON=no

```

Save and close the file. Setting DAEMON=no tells Sendmail to execute only the queue runner on this machine, and never to receive SMTP mail requests on port # 25.  
Step #2: Configure Mail Submission

You need to tell sedmail about a central MTA which will accept mail on port # 25 for all your domains. For e.g. [mail.nixcraft.net](http://mail.nixcraft.net) act as a central MTA. Edit /etc/mail/submit.cf, enter:

```auto
# vi /etc/mail/submit.cf

```

Find the line beginning with D{MTAHost}, and update it to read as follows:

```auto
D{MTAHost}mail.nixcraft.net

```

Save and close the file. [mail.nixcraft.net](http://mail.nixcraft.net) is the hostname of the server to which this machine should forward its all outgoing mail. Please note that [mail.nixcraft.net](http://mail.nixcraft.net) must be configured to accept mail from your other workstations or server. Once done reload sendmail.