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How To Map Local User to Email Address in ssmtp?

Ubuntu 21

In this article, we will explore how to map a local user to an email address in ssmtp, a simple mail transfer protocol. This can be particularly useful when you want to send emails from a specific user to a particular email address.

Quick Answer

To map a local user to an email address in ssmtp, you can use the revaliases file. Open the file, add an entry in the format local_username:email_address:mailhub, and save the changes. Now, whenever ssmtp sends an email from the mapped local user, it will use the specified email address.

What is ssmtp?

ssmtp is a send-only sendmail emulator for machines which need to send mail via an SMTP server. It’s lightweight and easy to configure, making it a popular choice for system administrators.

Prerequisites

Before we start, ensure that ssmtp is installed on your system. If it’s not, you can install it using the following command:

sudo apt-get install ssmtp

Also, make sure you have the necessary permissions to edit system files.

Configuring ssmtp

The main configuration file for ssmtp is located at /etc/ssmtp/ssmtp.conf. This file should already be set up with your SMTP server details. If not, you can edit it using:

sudo nano /etc/ssmtp/ssmtp.conf

Ensure that the mailhub setting is pointing to the correct mail server.

Mapping Local User to Email Address

To map a local user to an email address, we use the revaliases file. This file is used to determine what email address should be used in the “To:” field when ssmtp sends an email.

Step 1: Open the revaliases File

Open the revaliases file using a text editor. In this case, we’ll use nano:

sudo nano /etc/ssmtp/revaliases

Step 2: Add an Entry

In the revaliases file, add an entry in the following format:

local_username:email_address:mailhub

Here, replace local_username with the actual username, email_address with the desired email address, and mailhub with the appropriate mail server.

For example, if you want to map the local username “john” to the email address “john@example.com” and use “mail.example.com” as the mail server, the entry would look like:

john:john@example.com:mail.example.com

Step 3: Save and Exit

After adding the entry, save the file and exit the text editor. If you’re using nano, you can do this by pressing Ctrl+X, then Y to confirm saving the changes, and finally Enter to exit.

Conclusion

By following these steps, you have successfully mapped a local user to an email address in ssmtp. Now, whenever ssmtp sends an email from the mapped local user, it will use the specified email address. This can be extremely useful for system administrators who need to manage email notifications from various local users.

Remember to always double-check your configurations to ensure they’re correct. If you encounter any issues, the ssmtp logs can be a good place to start troubleshooting.

What is the purpose of `ssmtp`?

ssmtp is a send-only sendmail emulator used for sending mail via an SMTP server. It is designed to be lightweight and easy to configure, making it popular among system administrators.

How do I install `ssmtp`?

You can install ssmtp by running the command sudo apt-get install ssmtp in your terminal. This will install ssmtp on your system.

Where is the main configuration file for `ssmtp` located?

The main configuration file for ssmtp is located at /etc/ssmtp/ssmtp.conf.

How can I edit the `ssmtp` configuration file?

You can edit the ssmtp configuration file by using a text editor, such as nano. Run the command sudo nano /etc/ssmtp/ssmtp.conf to open the file in nano.

How do I map a local user to an email address in `ssmtp`?

To map a local user to an email address, you need to modify the revaliases file. Open the file using a text editor with the command sudo nano /etc/ssmtp/revaliases. Then add an entry in the format local_username:email_address:mailhub, replacing the placeholders with the actual values.

How do I save and exit the `nano` text editor?

To save and exit the nano text editor, press Ctrl+X, then type Y to confirm saving the changes, and finally press Enter to exit.

What should I do if I encounter issues with `ssmtp`?

If you encounter issues with ssmtp, you can check the ssmtp logs for more information. They can provide valuable insights for troubleshooting.

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