Unless you specifically want to use Mail.app, you can send mail using the command mail. Open a terminal and:
mail -s "Testing" `whoami`@`hostname`
<type something>
Ctrl-D to finish and send
These are backticks, not single quotes. whoamireturns the current username of the user and hostnamereturns the host name of the local computer. It can also be explicit:
mail -s "Testing" john@mymac.local
: . Mail.app ~/Mail, SQLite ( Envenlope Index). , , mailboxes messages. /. , , , Mail.app( ).
- Mail.app, mbox , , dbr. , , script - .