sendmail

Send email. More information: https://manned.org/sendmail.

• Send a message with the content of message.txt to the mail directory of local user username:

sendmail {{username}} < {{message.txt}}

• Send an email from you@yourdomain.com (assuming the mail server is configured for this) to test@gmail.com containing the message in message.txt:

sendmail -f {{you@yourdomain.com}} {{test@gmail.com}} < {{message.txt}}

• Send an email from you@yourdomain.com (assuming the mail server is configured for this) to test@gmail.com containing the file file.zip:

sendmail -f {{you@yourdomain.com}} {{test@gmail.com}} < {{file.zip}}