Right:

smart@smart-laptop:~$ postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
append_dot_mydomain = no
biff = no
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
home_mailbox = Maildir/
inet_interfaces = all
mailbox_command = /usr/lib/dovecot/deliver -c
/etc/dovecot/dovecot-postfix.conf -n -m "${EXTENSION}"
mailbox_size_limit = 0
mydestination = wadesmart.com, localhost.localdomain, localhost, wadesmart
mydomain = wadesmart.com
myhostname = wadesmart.com
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128, 192.168.1.0/110
myorigin = $mydomain
readme_directory = no
recipient_delimiter = +
relay_domains = $mydomain
relayhost = [smtpout.secureserver.net:465]
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtp_use_tls = yes
smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)
smtpd_recipient_restrictions = reject_unknown_sender_domain,
reject_unknown_recipient_domain, reject_unauth_pipelining,
permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_local_domain = wadesmart.com
smtpd_sasl_path = private/dovecot-auth
smtpd_sasl_security_options = noanonymous
smtpd_sasl_type = dovecot
smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_tls_auth_only = yes
smtpd_tls_cert_file = /etc/ssl/certs/ssl-mail.pem
smtpd_tls_key_file = /etc/ssl/private/ssl-mail.key
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_protocols = SSLv3, TLSv1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
smart@smart-laptop:~$

Then I test with

smart@smart-laptop:~$ sendmail wadesmart@...
Is this working?
.


And in the log I have:
...status=deferred (Host of domain name not found. Name service error
for name=smtpout.secureserver.net type=MX: Host not found, try again.

In the documentation it said to put [] around the host to turn off MX
lookups but I removed them to test again after I received this error:
fatal: valid hostname or network address required in server description:
[smtpout.secureserver.net:465]