msmtp

An SMTP client. It reads text from stdin and sends it to an SMTP server. More information: https://marlam.de/msmtp.

• Send an email using the default account configured in ~/.msmtprc:
  echo "{{Hello world}}" | msmtp {{[email protected]}}
• Send an email using a specific account configured in ~/.msmtprc:
  echo "{{Hello world}}" | msmtp --account={{account_name}} {{[email protected]}}
• Send an email without a configured account. The password should be specified in the ~/.msmtprc file:
  echo "{{Hello world}}" | msmtp --host={{localhost}} --port={{999}} --from={{[email protected]}} {{[email protected]}}