<https://forums.FreeBSD.org/threads/can-you-send-email-using-sendmail.61190/>
<http://schema.org/articleBody>
"First of all, I'm sorry if the title is confusing or doesn't make any sense but I'm simply confused by the intricacies of this whole email technology. I read somewhere that you can send email using sendmail -it < mail but it only goes as far as..."
<https://forums.freebsd.org/threads/can-you-send-email-using-sendmail.61190/#post-352364>