How to Send Emails to Multiple Recipients Using Sendmail on Linux

Send emails efficiently to multiple recipients using Sendmail on Linux. Our Sendmail Support team is ready to assist you. 

How to Send Emails to Multiple Recipients Using Sendmail on Linux

Sending emails to a group of people can save time and keep everyone in the loop. On Linux, Sendmail makes it easy to send messages to multiple recipients directly from the command line. A few simple steps are all it takes to reach your team quickly and efficiently.

Prerequisites

Sending emails to multiple recipients on Linux using Sendmail can be simple when a few things are ready, even if you have experience with Sendmail not working in AIX in other environments.

Setup Sendmail

• Install Sendmail and configure it to use a relay server, such as a sendmail smarthost gmail, in /etc/mail/sendmail.mc with your domain and mail routing.
• Update the configuration using the m4 command and restart Sendmail.

Network and DNS

• Make sure your system can reach the internet or a relay server.
• DNS must resolve recipient domains to their mail servers.

Recipients and Content

• Collect correct email addresses. Separate multiple recipients with commas in To, Cc, or Bcc.
• Prepare the email headers and body. Leave a blank line between headers and body.

Send Emails to Multiple Recipients Using Sendmail on Linux

Sending emails to multiple recipients on Linux becomes easy with Sendmail. Using the -t option allows Sendmail to read recipient addresses directly from the To, Cc, and Bcc headers.

Steps to Send Email Using a Script

1. Create Email Content

Prepare the email headers and message body in a script or text file. Make sure to leave a blank line between headers and the body.

#!/bin/bash

# Define recipients, subject, and message

recipient1="recipient1@example.com"

recipient2="recipient2@example.com"

cc_recipient="cc@example.com"

subject="Important Update"

body="Hello team,

This is a test email sent to multiple recipients using Sendmail.

Regards,

Your System"

# Build email content

email_content="To: $recipient1, $recipient2

Cc: $cc_recipient

Subject: $subject

$body"

# Send the email

echo "$email_content" | sendmail -t

How It Works

• To lists the main recipients separated by commas.
• Cc lists recipients who receive a copy. Multiple addresses are comma-separated.
• Subject sets the email title.
• A blank line separates headers from the body.
• The echo command pipes the content to Sendmail, which reads the headers to find recipients.

2. Run the Script

Save the script as send_multi_email.sh and make it executable.

chmod +x send_multi_email.shM

Execute the script

./send_multi_email.sh

Alternative Method for Plain Emails

You can send simple emails without Cc or Bcc headers by specifying recipients directly.

echo “This is the email body.” | sendmail recipient1@example.com recipient2@example.com

This sends the message to all listed recipients without parsing headers.

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Conclusion 

Sending emails to several people at once on Linux is simple and reliable. With the correct setup and clear steps, you can send messages to your team, clients, or any group efficiently. Sendmail Linux multiple recipients lets you reach everyone quickly and without errors.