How to Send Emails in Linux using Command Line and Email API

Linux administrators can send email from the command line using tools such as curl, mail/mailx, mpack, mutt, swaks, ssmtp, and openssl, each offering different levels of functionality for SMTP delivery, scripting, attachments, authentication, and message formatting. The instructions describe installing relevant packages on Debian- and Red Hat-based systems, configuring SMTP relays such as Mailtrap through Postfix or ssmtp, protecting credentials with configuration and hash files, and sending basic plain-text messages. They also cover Mailtrap’s Email Sending API, which uses curl and a Bash script with an API token after domain verification, along with checking delivery logs. Additional examples explain sending HTML messages, attachments, and emails to multiple recipients, while noting limitations such as mpack’s lack of multiple-attachment support and ssmtp’s discontinued status.

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