/etc/mail> echo "test mail" | /usr/lib/sendmail -v me@mydomain.com
me@mydomain.com... Connecting to [127.0.0.1] via relay...
220 localhost.localdomain ESMTP Sendmail 8.13.8/8.13.8; Mon, 4 Jan 2016 01:28:47 -0600
>>> EHLO localhost.localdomain
250-localhost.localdomain Hello <localuser> [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
>>> MAIL From:<root@localhost.localdomain> SIZE=10
250 2.1.0 <root@localhost.localdomain>... Sender ok
>>> RCPT To:<me@mydomain.com>
>>> DATA
250 2.1.5 <me@mydomain.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 u047Slui009033 Message accepted for delivery
me@umydomain.com... Sent (u047Slui009033 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 localhost.localdomain closing connection