msmtp

An SMTP client. It reads text from standard input 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 {{to@example.org}}

• Send an email using a specific account configured in ~/.msmtprc:

echo "{{Hello world}}" | msmtp --account={{account_name}} {{to@example.org}}

• 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={{from@example.org}} {{to@example.org}}