tldr/pages/common/mail.md

mail

The command operates on the user's mailbox if no argument is given. To send an email the message body is built from standard input.

• Send a typed email message. The command line below continues after pressing Enter key. Input CC email-id (optional) press Enter key. Input message text (can be multi-line). Press "Ctrl-D" key to complete the message text:

mail --subject="{{subject line}}" {{to_user@example.com}}

• Send an email that contains file content:

mail --subject="{{$HOSTNAME filename.txt}}" {{to_user@example.com}} < {{path/to/filename.txt}}

• Send a tar.gz file as an attachment:

tar cvzf - {{path/to/directory1 path/to/directory2}} | uuencode {{data.tar.gz}} | mail --subject="{{subject_line}}" {{to_user@example.com}}