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Changing Default FROM Address for mail Command using sSMTP

Ubuntu 6

In this article, we will delve into the process of changing the default ‘From’ address for the mail command using sSMTP. We will walk you through the steps and provide detailed explanations of the commands and parameters used.

Quick Answer

Yes, it is possible to change the default ‘From’ address for the mail command using sSMTP. This can be done by modifying the FromLineOverride setting in the sSMTP configuration file or by using the revaliases file to set a specific ‘From’ address for each user.

Understanding the mail Command and sSMTP

The mail command is a simple and popular method for sending emails from the command line in Unix-based systems. However, by default, the ‘From’ address is set to the username and hostname of the machine from which the email is sent. This may not always be desirable, especially when you want to present a more professional ‘From’ address to the recipients.

sSMTP (Simple SMTP) is a send-only sendmail emulator for Unix-based systems, which is perfect for forwarding local mail to a mail hub (SMTP server). It’s lightweight and easy to configure, making it a great choice for simple mail forwarding tasks.

Modifying the sSMTP Configuration File

To change the default ‘From’ address, we need to modify the sSMTP configuration file, which is usually located at /etc/ssmtp/ssmtp.conf.

Open the configuration file with a text editor. For this example, we’ll use nano:

sudo nano /etc/ssmtp/ssmtp.conf

Look for the line that starts with FromLineOverride. This line might be commented out by default, indicated by a hash mark (#) at the beginning:

#FromLineOverride=YES

To uncomment it, remove the hash mark:

FromLineOverride=YES

The FromLineOverride parameter allows the ‘From’ address to be modified by the mail command. By setting it to YES, we enable this functionality.

After making the changes, save the file and exit the text editor.

Setting a Specific ‘From’ Address for Each User

If you want to set a specific ‘From’ address for each user, you can use the revaliases file. Here’s how:

Open the sSMTP revaliases file, which is usually located at /etc/ssmtp/revaliases:

sudo nano /etc/ssmtp/revaliases

In this file, you can add a line for each user in the following format:

username:email@example.com:mail.example.com

Replace username with the actual username, email@example.com with the desired ‘From’ email address, and mail.example.com with the mail server you want to use.

For example, to set the ‘From’ address for the root user to root@example.com using the mail server mail.example.com, the line would be:

root:root@example.com:mail.example.com

After adding the necessary lines, save the file and exit the text editor.

Important Considerations

Keep in mind that changing the ‘From’ address for sendmail emulation is not directly supported by sSMTP. If you require this functionality, consider using a more advanced mail server like Exim or Postfix.

Conclusion

Changing the default ‘From’ address for the mail command using sSMTP can be achieved by modifying the FromLineOverride setting in the sSMTP configuration file or using the revaliases file to set a specific ‘From’ address for each user. However, for more complex mail handling tasks, you might want to consider using a full-fledged mail server.

How do I change the default ‘From’ address for the `mail` command using sSMTP?

To change the default ‘From’ address, you need to modify the sSMTP configuration file. Open the file /etc/ssmtp/ssmtp.conf using a text editor like nano. Look for the line that starts with FromLineOverride and uncomment it by removing the hash mark (#) at the beginning. Set FromLineOverride to YES to enable modifying the ‘From’ address. Save the file and exit the text editor.

Can I set a specific ‘From’ address for each user?

Yes, you can set a specific ‘From’ address for each user by using the revaliases file. Open the file /etc/ssmtp/revaliases with a text editor. Add a line for each user in the format username:email@example.com:mail.example.com, replacing username with the actual username, email@example.com with the desired ‘From’ email address, and mail.example.com with the mail server you want to use. Save the file and exit the text editor.

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