Sendmail how to send emails

Sendmail is a popular open-source mail transfer agent (MTA) that allows you to send and receive emails on a Linux or Unix-based system. Here's a step-by-step guide on how to send emails using sendmail:

Prerequisites:

1. Sendmail must be installed and configured on your system.
2. You need to have a valid email address and a mail server (SMTP) to send emails.

Sending an Email using Sendmail:

1. Open a terminal: Open a terminal on your Linux or Unix-based system.
2. Use the sendmail command: Type the following command to send an email:

   sendmail -v -t <recipient_email_address>

   Replace <recipient_email_address> with the actual email address of the recipient.

Options:

• -v enables verbose mode, which displays the email sending process.
• -t tells sendmail to read the email message from standard input.

Email Message:

After running the sendmail command, you'll be prompted to enter the email message. You can type the message, and then press Enter to send it.

Example Email Message:

From: [email protected]
To: [email protected]
Subject: Test Email

This is a test email sent using sendmail.

Sending the Email:

Once you've entered the email message, press Enter to send it. Sendmail will attempt to deliver the email to the recipient's email address.

Troubleshooting:

If you encounter any issues while sending an email using sendmail, you can check the sendmail logs for errors. The sendmail logs are usually located in /var/log/sendmail.log or /var/log/mail.log.

Additional Tips:

• You can use the -f option to specify the sender's email address:

  sendmail -f [email protected] -v -t <recipient_email_address>

• You can use the -s option to specify the subject of the email:

  sendmail -s "Test Email" -v -t <recipient_email_address>

• You can use the -a option to specify additional headers:

  sendmail -a "X-Priority: High" -v -t <recipient_email_address>

  Remember to replace <recipient_email_address> with the actual email address of the recipient.