Use the mail command...
Specify the sender with the -r switch
-------------------------------------
```
mail -s "Yer subject" [email protected] -- -r "[email protected]"
```
Use echo to send your emails
----------------------------
```
echo -e "TEST\n.\n" | mail -s "subject" [email protected] -- -r "[email protected]"
```
Note that we use the -e switch to preserve new lines.
Use a file as the contents of your email
----------------------------------------
```
mail -s "subject" [email protected] -- -r "[email protected]" < /tmp/email
```