====== SMTP testing ======
<code bash>
swaks --to "yehuda@korotkin.co.il" --from "test@korotkin.co.il" --server XX.XXX.XX.xXX --h-From "Test Korotkin <test@korotkin.co.il>" --h-Subject "This is Test Mail" --h-List-Unsubscribe '<mailto:test@korotkin.co.il?subject=unsubscribe_test>' --h-Precedence bulk --body ~/tmp/email.html --add-header "MIME-Version: 1.0" --add-header "Content-Type: text/html" 
</code>