root# sendmail myemail@mydomain.com
test
.
root#

timestamp myemail@mydomain.com... User unknown

timestamp sendmail[17220]: v2OIL5pc017220: to=myemail@mydomain.com, delay=00:00:00, mailer=local, pri=0, dsn=5.1.1, stat=User unknown

timestamp sendmail[17220]: v2OIL5pc017220: from=root, size=5, class=0, nrcpts=1, msgid=<201703241821.v2OIL5pc017220@localhost.localdomain>, relay=root@localhost

timestamp sendmail[17220]: v2OIL5pc017220: v2OIL5pd017220: DSN: User unknown

timestamp sendmail[17220]: v2OIL5pd017220: to=root, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31029, dsn=2.0.0, stat=Sent