disable_ipv6='true'
dc_eximconfig_configtype='smarthost'
dc_other_hostnames='hostname.mydomain.com'
dc_local_interfaces='127.0.0.1'
dc_readhost='mydomain.com'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='smtp.mydomain.com::587'
CFILEMODE='644'
dc_use_split_config='true'
dc_hide_mailname='true'
dc_mailname_in_oh='true'
dc_localdelivery='mail_spool

swaks --tls --auth --to me@mydomain.com --server smtp.mydomain.com:587

<~  235 2.7.0 Authentication successful
 ~> MAIL FROM:<username@hostname.mydomain.com>
<~  250 2.1.0 Ok
 ~> RCPT TO:<me@mydomain.com>
<~* 450 4.1.8 <username@hostname.mydomain.com>: Sender address rejected: Domain not found
 ~> QUIT
<~  221 2.0.0 Bye

mail me@mydomain.com

Recipient address rejected: Access denied